feat(rundown): clear a mixed field explicitly, cover both fixes with tests

Emptying a field which holds different values across the selection does not
submit, otherwise focusing it and tabbing away would wipe every entry. That
left no way to clear such a field, so text fields now offer an explicit
Clear action, shown only while the entries disagree. Once they agree the
field can be emptied by hand and the action is withdrawn.

Both of the fixes which multi edit depends on were unguarded, so the logic
moves into pure helpers alongside the existing hook helper convention:

- shouldSubmitValue covers an unknown initial value being submitted as an
  empty string
- applyPatchToEvents covers the optimistic batch update, whose signature now
  makes the original mistake of spreading the request body unrepresentable,
  and pins the custom field merge

Both tests were confirmed to fail against the original behaviour.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PDETGBrhwgAqgTHjmrmJGJ

apps/client/src/common/components/input/colour-input/SwatchSelect.tsx

@@ -6,7 +6,8 @@ import SwatchPicker from './SwatchPicker';
 import style from './SwatchSelect.module.scss';
 
 interface ColourInputProps {
-  value: string;
+  /** undefined represents values which do not agree, no swatch is highlighted */
+  value: string | undefined;
   name: 'colour';
   handleChange: (newValue: 'colour', name: string) => void;
 }
@@ -44,7 +45,11 @@ export default function SwatchSelect(props: ColourInputProps) {
       {colours.map((colour) => (
         <Swatch key={colour} color={colour} onClick={setColour} isSelected={value === colour} />
       ))}
-      <SwatchPicker color={value} onChange={setColour} isSelected={!colours.includes(value)} />
+      <SwatchPicker
+        color={value ?? ''}
+        onChange={setColour}
+        isSelected={value !== undefined && !colours.includes(value)}
+      />
     </div>
   );
 }

apps/client/src/common/components/input/text-input/__tests__/useReactiveTextInput.test.ts

@@ -0,0 +1,31 @@
+import { shouldSubmitValue } from '../useReactiveTextInput';
+
+describe('shouldSubmitValue()', () => {
+  it('submits a value which differs from the initial value', () => {
+    expect(shouldSubmitValue('new', 'old')).toBe(true);
+  });
+
+  it('does not submit a value which has not changed', () => {
+    expect(shouldSubmitValue('same', 'same')).toBe(false);
+  });
+
+  it('submits an empty value when the initial value is known', () => {
+    // clearing a field which has a value is a valid edit
+    expect(shouldSubmitValue('', 'old')).toBe(true);
+  });
+
+  it('does not submit an empty value when the initial value is unknown', () => {
+    // an unknown value renders as an empty field, submitting it on blur
+    // would overwrite every entry being edited with an empty value
+    expect(shouldSubmitValue('', undefined)).toBe(false);
+  });
+
+  it('submits a typed value when the initial value is unknown', () => {
+    expect(shouldSubmitValue('typed', undefined)).toBe(true);
+  });
+
+  it('submits an unchanged value when the caller opts in', () => {
+    expect(shouldSubmitValue('same', 'same', true)).toBe(true);
+    expect(shouldSubmitValue('', undefined, true)).toBe(true);
+  });
+});

apps/client/src/common/components/input/text-input/useReactiveTextInput.tsx

@@ -1,6 +1,23 @@
 import { HotkeyItem, getHotkeyHandler } from '@mantine/hooks';
 import { ChangeEvent, KeyboardEvent, RefObject, useCallback, useEffect, useMemo, useRef, useState } from 'react';
 
+/**
+ * Whether a value should be sent to the server
+ * An undefined initial value means that the value is unknown, for example when several
+ * entries are being edited and they do not agree on a value
+ * It is shown as an empty field, so submitting it would overwrite data the user has not edited
+ */
+export function shouldSubmitValue(
+  valueToSubmit: string,
+  initialText: string | undefined,
+  allowSubmitSameValue?: boolean,
+): boolean {
+  if (allowSubmitSameValue) {
+    return true;
+  }
+  return valueToSubmit !== (initialText ?? '');
+}
+
 interface UseReactiveTextInputReturn {
   value: string;
   onChange: (event: ChangeEvent<HTMLInputElement | HTMLTextAreaElement>) => void;
@@ -9,7 +26,8 @@ interface UseReactiveTextInputReturn {
 }
 
 export default function useReactiveTextInput(
-  initialText: string,
+  /** undefined represents an unknown value, the field is shown empty and blurring it submits nothing */
+  initialText: string | undefined,
   submitCallback: (newValue: string) => void,
   ref: RefObject<HTMLInputElement | HTMLTextAreaElement | null>,
   options?: {
@@ -22,7 +40,7 @@ export default function useReactiveTextInput(
     allowKeyboardNavigation?: boolean;
   },
 ): UseReactiveTextInputReturn {
-  const [text, setText] = useState<string>(initialText);
+  const [text, setText] = useState<string>(initialText ?? '');
   // track whether we are submitting via a submit key (eg enter) and avoid submitting again on blur
   const isKeyboardSubmitting = useRef(false);
   // track escape to prevent the subsequent blur from submitting
@@ -57,8 +75,7 @@ export default function useReactiveTextInput(
    */
   const handleSubmit = useCallback(
     (valueToSubmit: string) => {
-      // No need to update if it hasn't changed
-      if (valueToSubmit === initialText && !options?.allowSubmitSameValue) {
+      if (!shouldSubmitValue(valueToSubmit, initialText, options?.allowSubmitSameValue)) {
         options?.onCancelUpdate?.();
       } else {
         const cleanVal = valueToSubmit.trim();
@@ -86,10 +103,10 @@ export default function useReactiveTextInput(
   const handleEscape = useCallback(() => {
     isEscaping.current = true;
     // No need to update if it hasn't changed
-    setText(initialText);
+    setText(initialText ?? '');
     // force the text to be the initial value
     if (ref.current) {
-      ref.current.value = initialText;
+      ref.current.value = initialText ?? '';
     }
     options?.onCancelUpdate?.();
     setTimeout(() => ref.current?.blur()); // Immediate timeout to ensure text is set before blurring

apps/client/src/common/components/input/time-input/TimeInput.tsx

@@ -41,7 +41,10 @@ export default function TimeInput<T extends string>({
    * @description Resets input value to given
    */
   const resetValue = useCallback(() => {
-    if (typeof time !== 'number' || isNaN(time)) {
+    if (time === undefined) {
+      // there is no value to show, we leave the field empty so that the placeholder is visible
+      setValue('');
+    } else if (typeof time !== 'number' || isNaN(time)) {
       setValue('00:00:00');
     } else if (shouldFormat) {
       setValue(formatTime(time));

apps/client/src/common/components/select/Select.tsx

@@ -16,13 +16,21 @@ interface SelectProps<T> extends Omit<BaseSelect.Root.Props<T>, 'items'> {
   options: SelectOption<T>[];
   fluid?: boolean;
   size?: 'medium' | 'large';
+  /** shown when the value is null, used to represent values which do not agree */
+  placeholder?: string;
 }
 
-export default function Select<T>({ options, fluid, size = 'medium', ...selectRootProps }: SelectProps<T>) {
+export default function Select<T>({
+  options,
+  fluid,
+  size = 'medium',
+  placeholder,
+  ...selectRootProps
+}: SelectProps<T>) {
   return (
     <BaseSelect.Root items={options} {...selectRootProps}>
       <BaseSelect.Trigger className={cx([styles.select, styles[size], fluid && styles.fluid])}>
-        <BaseSelect.Value />
+        <BaseSelect.Value placeholder={placeholder} />
         <BaseSelect.Icon className={styles.selectIcon}>
           <LuChevronsUpDown />
         </BaseSelect.Icon>

apps/client/src/common/components/switch/Switch.module.scss

@@ -29,6 +29,11 @@
   }
 }
 
+/* values do not agree, we show an empty track instead of a thumb position */
+.mixed .thumb {
+  visibility: hidden;
+}
+
 .medium {
   padding: 2px;
   --width: calc(2.5rem + 4px);

apps/client/src/common/components/switch/Switch.tsx

@@ -6,11 +6,13 @@ import style from './Switch.module.scss';
 
 interface SwitchProps extends BaseSwitch.Root.Props {
   size?: 'medium' | 'large';
+  /** the switch represents several values which do not agree, we hide the thumb */
+  mixed?: boolean;
 }
 
-export default function Switch({ size = 'medium', ...switchProps }: SwitchProps) {
+export default function Switch({ size = 'medium', mixed, ...switchProps }: SwitchProps) {
   return (
-    <BaseSwitch.Root className={cx([style.switch, style[size]])} {...switchProps}>
+    <BaseSwitch.Root className={cx([style.switch, style[size], mixed && style.mixed])} {...switchProps}>
       <BaseSwitch.Thumb className={style.thumb} />
     </BaseSwitch.Root>
   );

apps/client/src/common/hooks/__tests__/entryAction.utils.test.ts

@@ -0,0 +1,76 @@
+import { OntimeEvent, OntimeGroup, RundownEntries, SupportedEntry } from 'ontime-types';
+
+import { applyPatchToEvents, canPredictBatchResult } from '../entryAction.utils';
+
+function makeEntries(): RundownEntries {
+  return {
+    '1': { type: SupportedEntry.Event, id: '1', title: 'one', custom: { lx: 'a', sound: 'x' } } as OntimeEvent,
+    '2': { type: SupportedEntry.Event, id: '2', title: 'two', custom: { lx: 'b' } } as OntimeEvent,
+    '3': { type: SupportedEntry.Event, id: '3', title: 'three', custom: {} } as OntimeEvent,
+    group: { type: SupportedEntry.Group, id: 'group', title: 'a group', custom: {} } as OntimeGroup,
+  };
+}
+
+describe('applyPatchToEvents()', () => {
+  it('applies the patch to the given events only', () => {
+    const patched = applyPatchToEvents(makeEntries(), ['1', '2'], { title: 'patched' });
+
+    expect((patched['1'] as OntimeEvent).title).toBe('patched');
+    expect((patched['2'] as OntimeEvent).title).toBe('patched');
+    expect((patched['3'] as OntimeEvent).title).toBe('three');
+  });
+
+  it('patches custom fields instead of replacing them', () => {
+    const patched = applyPatchToEvents(makeEntries(), ['1', '2'], { custom: { lx: 'new' } });
+
+    // the field which was not part of the patch must survive
+    expect((patched['1'] as OntimeEvent).custom).toStrictEqual({ lx: 'new', sound: 'x' });
+    expect((patched['2'] as OntimeEvent).custom).toStrictEqual({ lx: 'new' });
+  });
+
+  it('keeps the existing custom fields when the patch has none', () => {
+    const patched = applyPatchToEvents(makeEntries(), ['1'], { title: 'patched' });
+
+    expect((patched['1'] as OntimeEvent).custom).toStrictEqual({ lx: 'a', sound: 'x' });
+  });
+
+  it('ignores ids which are not in the rundown', () => {
+    const patched = applyPatchToEvents(makeEntries(), ['1', 'does-not-exist'], { title: 'patched' });
+
+    expect(Object.keys(patched)).toStrictEqual(['1', '2', '3', 'group']);
+    expect((patched['1'] as OntimeEvent).title).toBe('patched');
+  });
+
+  it('ignores entries which are not events', () => {
+    const patched = applyPatchToEvents(makeEntries(), ['group'], { title: 'patched' });
+
+    expect((patched.group as OntimeGroup).title).toBe('a group');
+  });
+
+  it('does not mutate the given entries', () => {
+    const entries = makeEntries();
+    applyPatchToEvents(entries, ['1'], { title: 'patched', custom: { lx: 'new' } });
+
+    expect((entries['1'] as OntimeEvent).title).toBe('one');
+    expect((entries['1'] as OntimeEvent).custom).toStrictEqual({ lx: 'a', sound: 'x' });
+  });
+
+  it('handles repeated ids', () => {
+    const patched = applyPatchToEvents(makeEntries(), ['1', '1'], { title: 'patched' });
+
+    expect((patched['1'] as OntimeEvent).title).toBe('patched');
+  });
+});
+
+describe('canPredictBatchResult()', () => {
+  it('allows resolving patches which do not affect the schedule', () => {
+    expect(canPredictBatchResult({ title: 'a title' })).toBe(true);
+    expect(canPredictBatchResult({ colour: 'red', flag: true })).toBe(true);
+  });
+
+  it('defers to the server when the duration changes', () => {
+    // a duration cascades into the start and end of every linked event
+    expect(canPredictBatchResult({ duration: 1000 })).toBe(false);
+    expect(canPredictBatchResult({ title: 'a title', duration: 1000 })).toBe(false);
+  });
+});

apps/client/src/common/hooks/entryAction.utils.ts

@@ -0,0 +1,39 @@
+import { EntryId, OntimeEvent, RundownEntries, isOntimeEvent } from 'ontime-types';
+
+/**
+ * Applies a patch to a set of events, used to optimistically resolve a batch edit
+ * Entries which are missing or are not events are left untouched, mirroring the server
+ * @returns a new entries object, the given entries are not mutated
+ */
+export function applyPatchToEvents(
+  entries: RundownEntries,
+  ids: EntryId[],
+  patch: Partial<OntimeEvent>,
+): RundownEntries {
+  const patchedEntries = { ...entries };
+
+  for (const id of new Set(ids)) {
+    const entry = patchedEntries[id];
+    if (!isOntimeEvent(entry)) {
+      continue;
+    }
+
+    patchedEntries[id] = {
+      ...entry,
+      ...patch,
+      // custom fields are patched, not replaced
+      custom: patch.custom ? { ...entry.custom, ...patch.custom } : entry.custom,
+    };
+  }
+
+  return patchedEntries;
+}
+
+/**
+ * Whether the result of a batch edit can be resolved without the server
+ * Changing the duration cascades through the rundown, so the resulting
+ * schedule is only known once the server has recalculated it
+ */
+export function canPredictBatchResult(patch: Partial<OntimeEvent>): boolean {
+  return !('duration' in patch);
+}

apps/client/src/common/hooks/useEntryAction.ts

@@ -52,6 +52,7 @@ import {
 } from '../api/rundown';
 import { logAxiosError } from '../api/utils';
 import { useEditorSettings } from '../stores/editorSettings';
+import { applyPatchToEvents, canPredictBatchResult } from './entryAction.utils';
 
 export type EventOptions = Partial<{
   // options of any new entries (event / delay / group)
@@ -483,21 +484,9 @@ function useEntryActionsForRundown(scopedRundownId: string | undefined) {
       // Snapshot the previous value
       const previousRundown = queryClient.getQueryData<Rundown>(queryKey);
 
-      if (previousRundown) {
-        const eventIds = new Set(data.ids);
-        const newRundown = { ...previousRundown.entries };
-
-        eventIds.forEach((eventId) => {
-          if (Object.hasOwn(newRundown, eventId)) {
-            const event = newRundown[eventId];
-            if (isOntimeEvent(event)) {
-              newRundown[eventId] = {
-                ...event,
-                ...data,
-              };
-            }
-          }
-        });
+      // when the result cannot be resolved here we wait for the recalculated rundown from the server
+      if (previousRundown && canPredictBatchResult(data.data)) {
+        const newRundown = applyPatchToEvents(previousRundown.entries, data.ids, data.data);
 
         queryClient.setQueryData<Rundown>(queryKey, {
           id: previousRundown.id,

apps/client/src/common/utils/time.ts

@@ -5,6 +5,7 @@ import {
   MILLIS_PER_SECOND,
   dayInMs,
   formatFromMillis,
+  getExpectedEnd,
   getExpectedStart,
 } from 'ontime-utils';
 
@@ -186,15 +187,13 @@ export function getExpectedTimesFromExtendedEvent(
       ...state,
     },
   );
-
+  const expectedEnd = getExpectedEnd(event, expectedStart, state.currentDay);
   const plannedEnd = event.timeStart + event.duration + event.delay;
 
   return {
     expectedStart,
     timeToStart: expectedStart - state.clock,
-    expectedEnd: event.countToEnd
-      ? Math.max(expectedStart + event.duration, plannedEnd)
-      : expectedStart + event.duration,
+    expectedEnd,
     plannedEnd,
   };
 }

apps/client/src/features/rundown/entry-editor/CuesheetEventEditor.tsx

@@ -22,10 +22,13 @@ export default function CuesheetEntryEditor({ entryId, rundown }: CuesheetEntryE
     return event ?? null;
   }, [entryId, rundown.entries, rundown.order.length]);
 
-  if (isOntimeEvent(entry)) {
+  // the cuesheet always edits a single entry
+  const events = useMemo(() => (isOntimeEvent(entry) ? [entry] : null), [entry]);
+
+  if (events) {
     return (
       <div className={style.entryEditor} data-testid='editor-container'>
-        <EventEditor event={entry} />
+        <EventEditor events={events} />
       </div>
     );
   }

apps/client/src/features/rundown/entry-editor/EntryEditor.module.scss

@@ -75,6 +75,26 @@
   gap: 1rem;
 }
 
+// a label with an action aligned to the end of the row
+.labelRow {
+  display: flex;
+  align-items: baseline;
+  justify-content: space-between;
+  gap: 0.5rem;
+}
+
+.clearAction {
+  font-size: $aux-text-size;
+  color: $blue-400;
+  margin-bottom: $element-inner-spacing; // match the label
+  text-decoration: underline;
+  text-underline-offset: 2px;
+
+  &:hover {
+    color: $blue-500;
+  }
+}
+
 .splitTwo {
   display: grid;
   grid-template-columns: 1fr 1fr;

apps/client/src/features/rundown/entry-editor/EventEditor.tsx

@@ -1,14 +1,19 @@
 import { OntimeEvent } from 'ontime-types';
-import { useCallback } from 'react';
+import { useCallback, useMemo } from 'react';
 
 import * as Editor from '../../../common/components/editor-utils/EditorUtils';
+import Info from '../../../common/components/info/Info';
 import AppLink from '../../../common/components/link/app-link/AppLink';
 import { useEntryActionsContext } from '../../../common/context/EntryActionsContext';
 import useCustomFields from '../../../common/hooks-query/useCustomFields';
+import EventEditorBatchSchedule from './composite/EventEditorBatchSchedule';
 import EntryEditorCustomFields from './composite/EventEditorCustomFields';
+import EventEditorSchedule from './composite/EventEditorSchedule';
 import EventEditorTimes from './composite/EventEditorTimes';
 import EventEditorTitles from './composite/EventEditorTitles';
 import EventEditorTriggers from './composite/EventEditorTriggers';
+import { mixedPlaceholder } from './entryEditor.utils';
+import { mergeEvents, resolveConflict } from './mergeEvents';
 
 import style from './EntryEditor.module.scss';
 
@@ -16,66 +21,115 @@ import style from './EntryEditor.module.scss';
 export type EventEditorUpdateFields = 'cue' | 'title' | 'note' | 'colour' | string;
 
 interface EventEditorProps {
-  event: OntimeEvent;
+  /** events being edited, editing several events at once shows a merged view of their values */
+  events: OntimeEvent[];
 }
 
-export default function EventEditor({ event }: EventEditorProps) {
+export default function EventEditor({ events }: EventEditorProps) {
   const { data: customFields } = useCustomFields();
-  const { updateEntry } = useEntryActionsContext();
+  const { updateEntry, batchUpdateEvents } = useEntryActionsContext();
 
   const isEditor = window.location.pathname.includes('editor');
 
+  const ids = useMemo(() => events.map((event) => event.id), [events]);
+  const merged = useMemo(() => mergeEvents(events), [events]);
+
+  // when editing a single event, we can show the values which are unique to it
+  const singleEvent = events.length === 1 ? events[0] : null;
+
+  /**
+   * Applies a patch to every event being edited
+   */
+  const submit = useCallback(
+    (patch: Partial<OntimeEvent>) => {
+      if (ids.length === 1) {
+        updateEntry({ id: ids[0], ...patch });
+        return;
+      }
+      batchUpdateEvents(patch, ids);
+    },
+    [batchUpdateEvents, ids, updateEntry],
+  );
+
   const handleSubmit = useCallback(
     (field: EventEditorUpdateFields, value: string) => {
       if (field.startsWith('custom-')) {
         const fieldLabel = field.split('custom-')[1];
-        updateEntry({ id: event.id, custom: { [fieldLabel]: value } });
+        submit({ custom: { [fieldLabel]: value } });
       } else {
-        updateEntry({ id: event.id, [field]: value });
+        submit({ [field]: value });
       }
     },
-    [event.id, updateEntry],
+    [submit],
   );
 
+  // inputs keep local state, we remount them when the edited entries change
+  const editorKey = ids.join();
+
   return (
     <div className={style.content}>
+      {singleEvent ? (
+        <EventEditorSchedule
+          key={`${editorKey}-schedule`}
+          eventId={singleEvent.id}
+          timeStart={singleEvent.timeStart}
+          timeEnd={singleEvent.timeEnd}
+          duration={singleEvent.duration}
+          timeStrategy={singleEvent.timeStrategy}
+          linkStart={singleEvent.linkStart}
+          delay={singleEvent.delay}
+        />
+      ) : (
+        <EventEditorBatchSchedule
+          key={`${editorKey}-schedule`}
+          duration={resolveConflict(merged.duration)}
+          submit={submit}
+        />
+      )}
       <EventEditorTimes
-        key={`${event.id}-times`}
-        eventId={event.id}
-        timeStart={event.timeStart}
-        timeEnd={event.timeEnd}
-        duration={event.duration}
-        timeStrategy={event.timeStrategy}
-        linkStart={event.linkStart}
-        countToEnd={event.countToEnd}
-        delay={event.delay}
-        endAction={event.endAction}
-        timerType={event.timerType}
-        timeWarning={event.timeWarning}
-        timeDanger={event.timeDanger}
+        key={`${editorKey}-times`}
+        countToEnd={resolveConflict(merged.countToEnd)}
+        endAction={resolveConflict(merged.endAction)}
+        timerType={resolveConflict(merged.timerType)}
+        timeWarning={resolveConflict(merged.timeWarning)}
+        timeDanger={resolveConflict(merged.timeDanger)}
+        submit={submit}
       />
       <EventEditorTitles
-        key={`${event.id}-titles`}
-        eventId={event.id}
-        cue={event.cue}
-        flag={event.flag}
-        title={event.title}
-        note={event.note}
-        colour={event.colour}
+        key={`${editorKey}-titles`}
+        eventId={singleEvent?.id ?? null}
+        eventCount={events.length}
+        cue={singleEvent?.cue ?? ''}
+        flag={resolveConflict(merged.flag)}
+        title={resolveConflict(merged.title)}
+        note={resolveConflict(merged.note)}
+        colour={resolveConflict(merged.colour)}
+        submit={submit}
       />
       <div className={style.column}>
         <Editor.Title>
           Custom Fields
           {isEditor && <AppLink search='settings=manage__custom'>Manage Custom Fields</AppLink>}
         </Editor.Title>
-        <EntryEditorCustomFields fields={customFields} handleSubmit={handleSubmit} entry={event} />
+        <EntryEditorCustomFields
+          key={`${editorKey}-custom`}
+          fields={customFields}
+          custom={merged.custom}
+          idKey={editorKey}
+          mixedPlaceholder={mixedPlaceholder}
+          handleSubmit={handleSubmit}
+        />
       </div>
       <div className={style.column}>
         <Editor.Title>
           Automations
-          {isEditor && <AppLink search='settings=automation'>Manage Automations</AppLink>}
+          {isEditor && singleEvent && <AppLink search='settings=automation'>Manage Automations</AppLink>}
         </Editor.Title>
-        <EventEditorTriggers triggers={event.triggers} eventId={event.id} />
+        {singleEvent ? (
+          <EventEditorTriggers triggers={singleEvent.triggers} eventId={singleEvent.id} />
+        ) : (
+          <Info>Automations are not available when editing multiple events</Info>
+        )}
       </div>
     </div>
   );

apps/client/src/features/rundown/entry-editor/GroupEditor.tsx

@@ -112,7 +112,12 @@ export default function GroupEditor({ group }: GroupEditorProps) {
           Custom Fields
           {isEditor && <AppLink search='settings=manage__custom'>Manage Custom Fields</AppLink>}
         </Editor.Title>
-        <EntryEditorCustomFields fields={customFields} handleSubmit={handleSubmit} entry={group} />
+        <EntryEditorCustomFields
+          fields={customFields}
+          handleSubmit={handleSubmit}
+          custom={group.custom}
+          idKey={group.id}
+        />
       </div>
     </div>
   );

apps/client/src/features/rundown/entry-editor/MilestoneEditor.tsx

@@ -69,7 +69,12 @@ export default function MilestoneEditor({ milestone }: MilestoneEditorProps) {
           Custom Fields
           {isEditor && <AppLink search='settings=manage__custom'>Manage Custom Fields</AppLink>}
         </Editor.Title>
-        <EntryEditorCustomFields fields={customFields} handleSubmit={handleSubmit} entry={milestone} />
+        <EntryEditorCustomFields
+          fields={customFields}
+          handleSubmit={handleSubmit}
+          custom={milestone.custom}
+          idKey={milestone.id}
+        />
       </div>
     </div>
   );

apps/client/src/features/rundown/entry-editor/RundownEntryEditor.tsx

@@ -1,4 +1,4 @@
-import { OntimeEntry, isOntimeEvent, isOntimeGroup, isOntimeMilestone } from 'ontime-types';
+import { OntimeEntry, OntimeEvent, isOntimeEvent, isOntimeGroup, isOntimeMilestone } from 'ontime-types';
 import { useMemo } from 'react';
 
 import useRundown from '../../../common/hooks-query/useRundown';
@@ -15,6 +15,25 @@ export default function RundownEntryEditor() {
   const selectedEvents = useEventSelection((state) => state.selectedEvents);
   const { data } = useRundown();
 
+  /**
+   * Events in the current selection
+   * Only events can be multi selected, groups and milestones are always selected on their own
+   */
+  const events = useMemo<OntimeEvent[]>(() => {
+    if (data.order.length === 0) {
+      return [];
+    }
+
+    const selection: OntimeEvent[] = [];
+    selectedEvents.forEach((entryId) => {
+      const entry = data.entries[entryId];
+      if (isOntimeEvent(entry)) {
+        selection.push(entry);
+      }
+    });
+    return selection;
+  }, [data.order.length, data.entries, selectedEvents]);
+
   const entry = useMemo<OntimeEntry | null>(() => {
     if (data.order.length === 0) {
       return null;
@@ -29,19 +48,20 @@ export default function RundownEntryEditor() {
     return event ?? null;
   }, [data.order.length, data.entries, selectedEvents]);
 
-  if (!entry) {
-    return <EventEditorEmpty />;
-  }
-
-  if (isOntimeEvent(entry)) {
+  if (events.length > 0) {
+    const singleEvent = events.length === 1 ? events[0] : null;
     return (
       <div className={style.rundownEditor} data-testid='editor-container'>
-        <EventEditor event={entry} />
-        <EventEditorFooter id={entry.id} cue={entry.cue} />
+        <EventEditor events={events} />
+        {singleEvent && <EventEditorFooter id={singleEvent.id} cue={singleEvent.cue} />}
       </div>
     );
   }
 
+  if (!entry) {
+    return <EventEditorEmpty />;
+  }
+
   if (isOntimeMilestone(entry)) {
     return (
       <div className={style.rundownEditor} data-testid='editor-container'>

apps/client/src/features/rundown/entry-editor/__tests__/mergeEvents.test.ts

@@ -0,0 +1,122 @@
+import { EndAction, OntimeEvent, SupportedEntry, TimerType } from 'ontime-types';
+
+import { conflict, isConflict, mergeEvents, resolveConflict } from '../mergeEvents';
+
+function makeEvent(patch: Partial<OntimeEvent>): OntimeEvent {
+  return {
+    type: SupportedEntry.Event,
+    id: 'event',
+    title: 'title',
+    note: 'note',
+    colour: '#FFCC78',
+    flag: false,
+    duration: 600000,
+    endAction: EndAction.None,
+    countToEnd: false,
+    timerType: TimerType.CountDown,
+    timeWarning: 120000,
+    timeDanger: 60000,
+    linkStart: true,
+    custom: {},
+    ...patch,
+  } as OntimeEvent;
+}
+
+describe('mergeEvents()', () => {
+  it('returns the values of a single event', () => {
+    const event = makeEvent({ id: '1', title: 'only event' });
+
+    expect(mergeEvents([event])).toStrictEqual({
+      title: 'only event',
+      note: 'note',
+      colour: '#FFCC78',
+      flag: false,
+      duration: 600000,
+      endAction: EndAction.None,
+      countToEnd: false,
+      timerType: TimerType.CountDown,
+      timeWarning: 120000,
+      timeDanger: 60000,
+      linkStart: true,
+      custom: {},
+    });
+  });
+
+  it('keeps values which are shared by all events', () => {
+    const merged = mergeEvents([makeEvent({ id: '1' }), makeEvent({ id: '2' }), makeEvent({ id: '3' })]);
+
+    expect(merged.title).toBe('title');
+    expect(merged.colour).toBe('#FFCC78');
+    expect(merged.timerType).toBe(TimerType.CountDown);
+    expect(merged.duration).toBe(600000);
+  });
+
+  it('marks only the fields which differ as conflicting', () => {
+    const merged = mergeEvents([makeEvent({ id: '1', title: 'first' }), makeEvent({ id: '2', title: 'second' })]);
+
+    expect(merged.title).toBe(conflict);
+    expect(merged.note).toBe('note');
+    expect(merged.colour).toBe('#FFCC78');
+    expect(merged.flag).toBe(false);
+  });
+
+  it('handles boolean and numeric fields', () => {
+    const merged = mergeEvents([
+      makeEvent({ id: '1', flag: true, timeWarning: 1000, duration: 1000 }),
+      makeEvent({ id: '2', flag: false, timeWarning: 1000, duration: 2000 }),
+    ]);
+
+    expect(merged.flag).toBe(conflict);
+    expect(merged.timeWarning).toBe(1000);
+    expect(merged.duration).toBe(conflict);
+  });
+
+  describe('custom fields', () => {
+    it('merges values under the same key', () => {
+      const merged = mergeEvents([
+        makeEvent({ id: '1', custom: { lx: 'same', sound: 'a' } }),
+        makeEvent({ id: '2', custom: { lx: 'same', sound: 'b' } }),
+      ]);
+
+      expect(merged.custom).toStrictEqual({ lx: 'same', sound: conflict });
+    });
+
+    it('treats a missing key as empty', () => {
+      const merged = mergeEvents([makeEvent({ id: '1', custom: { lx: 'value' } }), makeEvent({ id: '2', custom: {} })]);
+
+      expect(merged.custom).toStrictEqual({ lx: conflict });
+    });
+
+    it('collects keys from all events', () => {
+      const merged = mergeEvents([
+        makeEvent({ id: '1', custom: { lx: '' } }),
+        makeEvent({ id: '2', custom: { sound: 'value' } }),
+      ]);
+
+      // lx is empty in both events, sound is only filled in one of them
+      expect(merged.custom).toStrictEqual({ lx: '', sound: conflict });
+    });
+
+    it('does not report a key which is absent from every event', () => {
+      const merged = mergeEvents([makeEvent({ id: '1', custom: {} }), makeEvent({ id: '2', custom: {} })]);
+
+      expect(merged.custom).toStrictEqual({});
+      // an absent key is distinguishable from a conflicting one
+      expect(merged.custom.lx).toBeUndefined();
+      expect(isConflict(merged.custom.lx)).toBe(false);
+    });
+  });
+});
+
+describe('resolveConflict()', () => {
+  it('passes known values through', () => {
+    expect(resolveConflict('value')).toBe('value');
+    expect(resolveConflict(0)).toBe(0);
+    expect(resolveConflict(false)).toBe(false);
+    expect(resolveConflict('')).toBe('');
+  });
+
+  it('resolves a conflict to undefined', () => {
+    expect(resolveConflict(conflict)).toBeUndefined();
+  });
+});

apps/client/src/features/rundown/entry-editor/composite/EventEditorBatchSchedule.tsx

@@ -0,0 +1,48 @@
+import { OntimeEvent } from 'ontime-types';
+import { MILLIS_PER_SECOND, dayInMs, parseUserTime } from 'ontime-utils';
+import { memo } from 'react';
+
+import * as Editor from '../../../../common/components/editor-utils/EditorUtils';
+import TimeInput from '../../../../common/components/input/time-input/TimeInput';
+import { mixedPlaceholder } from '../entryEditor.utils';
+
+import style from '../EntryEditor.module.scss';
+
+interface EventEditorBatchScheduleProps {
+  /** undefined when the events do not share a duration */
+  duration: number | undefined;
+  submit: (patch: Partial<OntimeEvent>) => void;
+}
+
+/**
+ * Schedule fields which can be applied to several events at once
+ * Start and end times are absolute points in time: giving several events the same
+ * value would collapse their durations, so only the duration is offered here
+ * The server infers the duration lock and recalculates the rundown once for the whole batch
+ */
+export default memo(EventEditorBatchSchedule);
+function EventEditorBatchSchedule({ duration, submit }: EventEditorBatchScheduleProps) {
+  const handleSubmit = (_field: 'duration', value: string) => {
+    // durations cannot exceed a day
+    submit({ duration: Math.min(parseUserTime(value), dayInMs - MILLIS_PER_SECOND) });
+  };
+
+  return (
+    <div className={style.column}>
+      <Editor.Title>Event schedule</Editor.Title>
+      <div className={style.splitTwo}>
+        <div>
+          <Editor.Label htmlFor='duration'>Duration</Editor.Label>
+          <TimeInput
+            id='duration'
+            name='duration'
+            submitHandler={handleSubmit}
+            time={duration}
+            placeholder={duration === undefined ? mixedPlaceholder : 'Duration'}
+            align='left'
+          />
+        </div>
+      </div>
+    </div>
+  );
+}

apps/client/src/features/rundown/entry-editor/composite/EventEditorCustomFields.tsx

@@ -1,8 +1,9 @@
-import { CustomFields, OntimeEvent, OntimeGroup, OntimeMilestone } from 'ontime-types';
+import { CustomFields, EntryCustomFields } from 'ontime-types';
 import { CSSProperties, Fragment } from 'react';
 
 import { getAccessibleColour } from '../../../../common/utils/styleUtils';
 import { EventEditorUpdateFields } from '../EventEditor';
+import { MergedCustomFields, resolveConflict } from '../mergeEvents';
 import EventEditorImage from './EventEditorImage';
 import EventTextArea from './EventTextArea';
 import EntryEditorTextInput from './EventTextInput';
@@ -11,21 +12,29 @@ import style from '../EntryEditor.module.scss';
 
 interface EntryEditorCustomFieldsProps {
   fields: CustomFields;
-  entry: OntimeEvent | OntimeGroup | OntimeMilestone;
+  /** values of the entries being edited, undefined when the entries do not agree */
+  custom: EntryCustomFields | MergedCustomFields;
+  /** used to generate stable keys for the fields */
+  idKey: string;
+  mixedPlaceholder?: string;
   handleSubmit: (field: EventEditorUpdateFields, value: string) => void;
 }
 
 export default function EntryEditorCustomFields({
   fields: customFields,
+  custom,
+  idKey,
+  mixedPlaceholder,
   handleSubmit,
-  entry,
 }: EntryEditorCustomFieldsProps) {
   return (
     <Fragment>
       {Object.keys(customFields).map((fieldKey) => {
-        const key = `${entry.id}-${fieldKey}`;
+        const key = `${idKey}-${fieldKey}`;
         const fieldName = `custom-${fieldKey}`;
-        const initialValue = entry.custom[fieldKey] ?? '';
+        // a key which is absent from the merged view is not present in any of the entries
+        const initialValue = resolveConflict(custom[fieldKey] ?? '');
+        const placeholder = initialValue === undefined ? mixedPlaceholder : undefined;
         const { backgroundColor, color } = getAccessibleColour(customFields[fieldKey].colour);
         const labelText = customFields[fieldKey].label;
 
@@ -36,6 +45,7 @@ export default function EntryEditorCustomFields({
               field={fieldName}
               label={labelText}
               initialValue={initialValue}
+              placeholder={placeholder}
               submitHandler={handleSubmit}
               className={style.decorated}
               style={{ '--decorator-bg': backgroundColor, '--decorator-color': color } as CSSProperties}
@@ -51,13 +61,13 @@ export default function EntryEditorCustomFields({
                 field={fieldName}
                 label={labelText}
                 initialValue={initialValue}
-                placeholder='Paste image URL'
+                placeholder={placeholder ?? 'Paste image URL'}
                 submitHandler={handleSubmit}
                 className={style.decorated}
                 maxLength={255}
                 style={{ '--decorator-bg': backgroundColor, '--decorator-color': color } as CSSProperties}
               />
-              <EventEditorImage src={initialValue} />
+              <EventEditorImage src={initialValue ?? ''} />
             </div>
           );
         }

apps/client/src/features/rundown/entry-editor/composite/EventEditorSchedule.tsx

@@ -0,0 +1,62 @@
+import { TimeStrategy } from 'ontime-types';
+import { memo } from 'react';
+
+import * as Editor from '../../../../common/components/editor-utils/EditorUtils';
+import { millisToDelayString } from '../../../../common/utils/dateConfig';
+import { formatTime, normaliseWallClock } from '../../../../common/utils/time';
+import TimeInputFlow from '../../time-input-flow/TimeInputFlow';
+
+import style from '../EntryEditor.module.scss';
+
+interface EventEditorScheduleProps {
+  eventId: string;
+  timeStart: number;
+  timeEnd: number;
+  duration: number;
+  timeStrategy: TimeStrategy;
+  linkStart: boolean;
+  delay: number;
+}
+
+/**
+ * Schedule of a single event
+ * Schedule values cascade through the rundown, so they are not editable across a selection
+ */
+export default memo(EventEditorSchedule);
+function EventEditorSchedule({
+  eventId,
+  timeStart,
+  timeEnd,
+  duration,
+  timeStrategy,
+  linkStart,
+  delay,
+}: EventEditorScheduleProps) {
+  const hasDelay = delay !== 0;
+  const delayedStart = normaliseWallClock(timeStart + delay);
+  const delayedEnd = normaliseWallClock(timeEnd + delay);
+  const delayLabel = hasDelay
+    ? `Event is ${millisToDelayString(delay, 'expanded')}. New schedule ${formatTime(delayedStart)} → ${formatTime(delayedEnd)}`
+    : '';
+
+  return (
+    <div className={style.column}>
+      <Editor.Title>Event schedule</Editor.Title>
+      <div>
+        <div className={style.inline}>
+          <TimeInputFlow
+            eventId={eventId}
+            timeStart={timeStart}
+            timeEnd={timeEnd}
+            duration={duration}
+            timeStrategy={timeStrategy}
+            linkStart={linkStart}
+            delay={delay}
+            showLabels
+          />
+        </div>
+        <div className={style.delayLabel}>{delayLabel}</div>
+      </div>
+    </div>
+  );
+}

apps/client/src/features/rundown/entry-editor/composite/EventEditorTimes.tsx

@@ -1,4 +1,4 @@
-import { EndAction, TimeStrategy, TimerType } from 'ontime-types';
+import { EndAction, OntimeEvent, TimerType } from 'ontime-types';
 import { parseUserTime } from 'ontime-utils';
 import { memo } from 'react';
 import { IoInformationCircle } from 'react-icons/io5';
@@ -8,103 +8,47 @@ import TimeInput from '../../../../common/components/input/time-input/TimeInput'
 import Select from '../../../../common/components/select/Select';
 import Switch from '../../../../common/components/switch/Switch';
 import Tooltip from '../../../../common/components/tooltip/Tooltip';
-import { useEntryActionsContext } from '../../../../common/context/EntryActionsContext';
-import { millisToDelayString } from '../../../../common/utils/dateConfig';
-import { formatTime, normaliseWallClock } from '../../../../common/utils/time';
-import TimeInputFlow from '../../time-input-flow/TimeInputFlow';
+import { mixedPlaceholder, switchLabel } from '../entryEditor.utils';
 
 import style from '../EntryEditor.module.scss';
 
 interface EventEditorTimesProps {
-  eventId: string;
-  timeStart: number;
-  timeEnd: number;
-  duration: number;
-  timeStrategy: TimeStrategy;
-  linkStart: boolean;
-  countToEnd: boolean;
-  delay: number;
-  endAction: EndAction;
-  timerType: TimerType;
-  timeWarning: number;
-  timeDanger: number;
+  countToEnd: boolean | undefined;
+  endAction: EndAction | undefined;
+  timerType: TimerType | undefined;
+  timeWarning: number | undefined;
+  timeDanger: number | undefined;
+  submit: (patch: Partial<OntimeEvent>) => void;
 }
 
-type HandledActions = 'countToEnd' | 'timerType' | 'endAction' | 'timeWarning' | 'timeDanger';
+type TimeFields = 'timeWarning' | 'timeDanger';
 
 export default memo(EventEditorTimes);
 function EventEditorTimes({
-  eventId,
-  timeStart,
-  timeEnd,
-  duration,
-  timeStrategy,
-  linkStart,
   countToEnd,
-  delay,
   endAction,
   timerType,
   timeWarning,
   timeDanger,
+  submit,
 }: EventEditorTimesProps) {
-  const { updateEntry } = useEntryActionsContext();
-
-  const handleSubmit = (field: HandledActions, value: string | boolean) => {
-    if (field === 'countToEnd') {
-      updateEntry({ id: eventId, countToEnd: value as boolean });
-      return;
-    }
-
-    if (field === 'timeWarning' || field === 'timeDanger') {
-      const newTime = parseUserTime(value as string);
-      updateEntry({ id: eventId, [field]: newTime });
-      return;
-    }
-
-    if (field === 'timerType' || field === 'endAction') {
-      updateEntry({ id: eventId, [field]: value });
-      return;
-    }
+  const handleTimeSubmit = (field: TimeFields, value: string) => {
+    submit({ [field]: parseUserTime(value) });
   };
 
-  const hasDelay = delay !== 0;
-  const delayedStart = normaliseWallClock(timeStart + delay);
-  const delayedEnd = normaliseWallClock(timeEnd + delay);
-  const delayLabel = hasDelay
-    ? `Event is ${millisToDelayString(delay, 'expanded')}. New schedule ${formatTime(delayedStart)} → ${formatTime(delayedEnd)}`
-    : '';
-
   return (
     <>
-      <div className={style.column}>
-        <Editor.Title>Event schedule</Editor.Title>
-        <div>
-          <div className={style.inline}>
-            <TimeInputFlow
-              eventId={eventId}
-              timeStart={timeStart}
-              timeEnd={timeEnd}
-              duration={duration}
-              timeStrategy={timeStrategy}
-              linkStart={linkStart}
-              delay={delay}
-              showLabels
-            />
-          </div>
-          <div className={style.delayLabel}>{delayLabel}</div>
-        </div>
-      </div>
-
       <div className={style.column}>
         <Editor.Title>Event Behaviour</Editor.Title>
         <div className={style.splitTwo}>
           <div>
             <Editor.Label htmlFor='endAction'>End Action</Editor.Label>
             <Select
-              value={endAction}
+              value={endAction ?? null}
+              placeholder={mixedPlaceholder}
               onValueChange={(value: EndAction | null) => {
                 if (value === null) return;
-                handleSubmit('endAction', value);
+                submit({ endAction: value });
               }}
               options={[
                 { value: EndAction.None, label: 'None' },
@@ -118,10 +62,11 @@ function EventEditorTimes({
             <Editor.Label className={style.switchLabel}>
               <Switch
                 id='countToEnd'
-                checked={countToEnd}
-                onCheckedChange={(value) => handleSubmit('countToEnd', value)}
+                checked={countToEnd ?? false}
+                mixed={countToEnd === undefined}
+                onCheckedChange={(value) => submit({ countToEnd: value })}
               />
-              {countToEnd ? 'On' : 'Off'}
+              {switchLabel(countToEnd)}
             </Editor.Label>
           </div>
         </div>
@@ -141,10 +86,11 @@ function EventEditorTimes({
           <div>
             <Editor.Label htmlFor='timerType'>Timer Type</Editor.Label>
             <Select
-              value={timerType}
+              value={timerType ?? null}
+              placeholder={mixedPlaceholder}
               onValueChange={(value: TimerType | null) => {
                 if (value === null) return;
-                handleSubmit('timerType', value);
+                submit({ timerType: value });
               }}
               options={[
                 { value: TimerType.CountDown, label: 'Count down' },
@@ -161,9 +107,9 @@ function EventEditorTimes({
               <TimeInput
                 id='timeWarning'
                 name='timeWarning'
-                submitHandler={handleSubmit}
+                submitHandler={handleTimeSubmit}
                 time={timeWarning}
-                placeholder='Duration'
+                placeholder={timeWarning === undefined ? mixedPlaceholder : 'Duration'}
               />
             </div>
             <div>
@@ -171,9 +117,9 @@ function EventEditorTimes({
               <TimeInput
                 id='timeDanger'
                 name='timeDanger'
-                submitHandler={handleSubmit}
+                submitHandler={handleTimeSubmit}
                 time={timeDanger}
-                placeholder='Duration'
+                placeholder={timeDanger === undefined ? mixedPlaceholder : 'Duration'}
               />
             </div>
           </div>

apps/client/src/features/rundown/entry-editor/composite/EventEditorTitles.tsx

@@ -1,34 +1,36 @@
+import { OntimeEvent } from 'ontime-types';
 import { memo } from 'react';
 
 import * as Editor from '../../../../common/components/editor-utils/EditorUtils';
 import SwatchSelect from '../../../../common/components/input/colour-input/SwatchSelect';
 import Input from '../../../../common/components/input/input/Input';
 import Switch from '../../../../common/components/switch/Switch';
-import { useEntryActionsContext } from '../../../../common/context/EntryActionsContext';
+import { enDash } from '../../../../common/utils/styleUtils';
+import { mixedPlaceholder, switchLabel } from '../entryEditor.utils';
 import EventTextArea from './EventTextArea';
 import EntryEditorTextInput from './EventTextInput';
 
 import style from '../EntryEditor.module.scss';
 
 interface EventEditorTitlesProps {
-  eventId: string;
+  /** id of the event being edited, null when editing several events */
+  eventId: string | null;
+  /** amount of events being edited */
+  eventCount: number;
   cue: string;
-  flag: boolean;
-  title: string;
-  note: string;
-  colour: string;
+  flag: boolean | undefined;
+  title: string | undefined;
+  note: string | undefined;
+  colour: string | undefined;
+  submit: (patch: Partial<OntimeEvent>) => void;
 }
 
 export default memo(EventEditorTitles);
-function EventEditorTitles({ eventId, cue, flag, title, note, colour }: EventEditorTitlesProps) {
-  const { updateEntry } = useEntryActionsContext();
-
-  const flagSubmitHandler = (newValue: boolean) => {
-    updateEntry({ id: eventId, flag: newValue });
-  };
+function EventEditorTitles({ eventId, eventCount, cue, flag, title, note, colour, submit }: EventEditorTitlesProps) {
+  const isMulti = eventId === null;
 
   const textSubmitHandler = (field: string, newValue: string) => {
-    updateEntry({ id: eventId, [field]: newValue });
+    submit({ [field]: newValue });
   };
 
   return (
@@ -36,21 +38,39 @@ function EventEditorTitles({ eventId, cue, flag, title, note, colour }: EventEdi
       <Editor.Title>Event Data</Editor.Title>
       <div className={style.splitThree}>
         <div>
-          <Editor.Label htmlFor='eventId'>Event ID (read only)</Editor.Label>
-          <Input id='eventId' data-testid='input-textfield' value={eventId} readOnly fluid />
+          <Editor.Label htmlFor='eventId'>{isMulti ? 'Selection (read only)' : 'Event ID (read only)'}</Editor.Label>
+          <Input
+            id='eventId'
+            data-testid='input-textfield'
+            value={isMulti ? `${eventCount} events selected` : eventId}
+            readOnly
+            fluid
+          />
         </div>
-        <EntryEditorTextInput
-          field='cue'
-          label='Cue'
-          initialValue={cue}
-          submitHandler={textSubmitHandler}
-          maxLength={10}
-        />
+        {isMulti ? (
+          <div>
+            <Editor.Label htmlFor='cue'>Cue (not available)</Editor.Label>
+            <Input id='cue' value={enDash} readOnly fluid />
+          </div>
+        ) : (
+          <EntryEditorTextInput
+            field='cue'
+            label='Cue'
+            initialValue={cue}
+            submitHandler={textSubmitHandler}
+            maxLength={10}
+          />
+        )}
         <div>
           <Editor.Label htmlFor='flag'>Flag</Editor.Label>
           <Editor.Label className={style.switchLabel}>
-            <Switch id='flag' checked={flag} onCheckedChange={flagSubmitHandler} />
-            {flag ? 'On' : 'Off'}
+            <Switch
+              id='flag'
+              checked={flag ?? false}
+              mixed={flag === undefined}
+              onCheckedChange={(newValue) => submit({ flag: newValue })}
+            />
+            {switchLabel(flag)}
           </Editor.Label>
         </div>
       </div>
@@ -58,8 +78,20 @@ function EventEditorTitles({ eventId, cue, flag, title, note, colour }: EventEdi
         <Editor.Label>Colour</Editor.Label>
         <SwatchSelect name='colour' value={colour} handleChange={textSubmitHandler} />
       </div>
-      <EntryEditorTextInput field='title' label='Title' initialValue={title} submitHandler={textSubmitHandler} />
-      <EventTextArea field='note' label='Note' initialValue={note} submitHandler={textSubmitHandler} />
+      <EntryEditorTextInput
+        field='title'
+        label='Title'
+        initialValue={title}
+        placeholder={title === undefined ? mixedPlaceholder : undefined}
+        submitHandler={textSubmitHandler}
+      />
+      <EventTextArea
+        field='note'
+        label='Note'
+        initialValue={note}
+        placeholder={note === undefined ? mixedPlaceholder : undefined}
+        submitHandler={textSubmitHandler}
+      />
     </div>
   );
 }

apps/client/src/features/rundown/entry-editor/composite/EventTextArea.tsx

@@ -5,11 +5,15 @@ import { AutoTextarea } from '../../../../common/components/input/auto-textarea/
 import useReactiveTextInput from '../../../../common/components/input/text-input/useReactiveTextInput';
 import { EventEditorUpdateFields } from '../EventEditor';
 
+import style from '../EntryEditor.module.scss';
+
 interface CountedTextAreaProps {
   className?: string;
   field: EventEditorUpdateFields;
   label: string;
-  initialValue: string;
+  /** undefined represents values which do not agree across the edited entries */
+  initialValue: string | undefined;
+  placeholder?: string;
   style?: CSSProperties;
   submitHandler: (field: EventEditorUpdateFields, value: string) => void;
 }
@@ -19,6 +23,7 @@ export default function EventTextArea({
   field,
   label,
   initialValue,
+  placeholder,
   style: givenStyles,
   submitHandler,
 }: CountedTextAreaProps) {
@@ -29,16 +34,27 @@ export default function EventTextArea({
     submitOnCtrlEnter: true,
   });
 
+  // an unknown value cannot be cleared by emptying the field, we offer an explicit action
+  const canClear = initialValue === undefined;
+
   return (
     <div>
-      <Editor.Label className={className} htmlFor={field} style={givenStyles}>
-        {label}
-      </Editor.Label>
+      <div className={style.labelRow}>
+        <Editor.Label className={className} htmlFor={field} style={givenStyles}>
+          {label}
+        </Editor.Label>
+        {canClear && (
+          <button type='button' className={style.clearAction} onClick={() => submitCallback('')}>
+            Clear
+          </button>
+        )}
+      </div>
       <AutoTextarea
         id={field}
         inputref={ref}
         rows={1}
         data-testid='input-textarea'
+        placeholder={placeholder}
         fluid
         value={value}
         onChange={onChange}

apps/client/src/features/rundown/entry-editor/composite/EventTextInput.tsx

@@ -6,10 +6,13 @@ import useReactiveTextInput from '../../../../common/components/input/text-input
 import { EventEditorUpdateFields } from '../EventEditor';
 import { GroupEditorUpdateTextFields } from '../GroupEditor';
 
+import style from '../EntryEditor.module.scss';
+
 interface EntryEditorTextInputProps extends InputProps {
   field: EventEditorUpdateFields | GroupEditorUpdateTextFields;
   label: string;
-  initialValue: string;
+  /** undefined represents values which do not agree across the edited entries */
+  initialValue: string | undefined;
   placeholder?: string;
   submitHandler: (field: EventEditorUpdateFields, value: string) => void;
 }
@@ -31,11 +34,21 @@ export default function EntryEditorTextInput({
     submitOnEnter: true,
   });
 
+  // an unknown value cannot be cleared by emptying the field, we offer an explicit action
+  const canClear = initialValue === undefined;
+
   return (
     <div>
-      <Editor.Label className={className} htmlFor={field} style={givenStyles}>
-        {label}
-      </Editor.Label>
+      <div className={style.labelRow}>
+        <Editor.Label className={className} htmlFor={field} style={givenStyles}>
+          {label}
+        </Editor.Label>
+        {canClear && (
+          <button type='button' className={style.clearAction} onClick={() => submitCallback('')}>
+            Clear
+          </button>
+        )}
+      </div>
       <Input
         id={field}
         ref={ref}

apps/client/src/features/rundown/entry-editor/entryEditor.utils.ts

@@ -0,0 +1,10 @@
+/** Shown in place of a value when the entries being edited do not agree */
+export const mixedPlaceholder = 'Mixed';
+
+/** Returns the label of a switch which may represent values that do not agree */
+export function switchLabel(value: boolean | undefined): string {
+  if (value === undefined) {
+    return mixedPlaceholder;
+  }
+  return value ? 'On' : 'Off';
+}

apps/client/src/features/rundown/entry-editor/mergeEvents.ts

@@ -0,0 +1,108 @@
+import { CustomFieldKey, OntimeEvent } from 'ontime-types';
+
+/**
+ * Marks a value which is not the same across the entries being edited
+ * This is a distinct value from undefined, which means that the field is absent
+ * Being a symbol, it also cannot be assigned to a patch by accident
+ */
+export const conflict: unique symbol = Symbol('conflict');
+export type Conflict = typeof conflict;
+
+/** A value which may not be the same across the entries being edited */
+export type MergedValue<T> = T | Conflict;
+
+export function isConflict<T>(value: MergedValue<T>): value is Conflict {
+  return value === conflict;
+}
+
+/** Resolves a merged value for the UI, where an unknown value is represented by undefined */
+export function resolveConflict<T>(value: MergedValue<T>): T | undefined {
+  return isConflict(value) ? undefined : value;
+}
+
+/**
+ * Fields which can be edited across a selection of events
+ * timeStart and timeEnd are absolute points in time and are excluded:
+ * giving several events the same start or end collapses their durations
+ */
+export const batchEditableFields = [
+  'title',
+  'note',
+  'colour',
+  'flag',
+  'duration',
+  'endAction',
+  'countToEnd',
+  'timerType',
+  'timeWarning',
+  'timeDanger',
+  'linkStart',
+] as const;
+
+type BatchEditableField = (typeof batchEditableFields)[number];
+
+/**
+ * Custom fields of the entries being edited
+ * A missing key means that none of the entries have a value for that field
+ */
+export type MergedCustomFields = Record<CustomFieldKey, MergedValue<string>>;
+
+/**
+ * A merged view over a set of events
+ * A field holds the conflict symbol when the events do not agree on its value
+ */
+export type MergedEvent = {
+  [K in BatchEditableField]: MergedValue<OntimeEvent[K]>;
+} & {
+  custom: MergedCustomFields;
+};
+
+/**
+ * Merges a list of events into a single view
+ * For a single event, no field is in conflict and every value matches the event
+ * @param events - events to merge, must contain at least one element
+ */
+export function mergeEvents(events: OntimeEvent[]): MergedEvent {
+  return {
+    title: mergeField(events, 'title'),
+    note: mergeField(events, 'note'),
+    colour: mergeField(events, 'colour'),
+    flag: mergeField(events, 'flag'),
+    duration: mergeField(events, 'duration'),
+    endAction: mergeField(events, 'endAction'),
+    countToEnd: mergeField(events, 'countToEnd'),
+    timerType: mergeField(events, 'timerType'),
+    timeWarning: mergeField(events, 'timeWarning'),
+    timeDanger: mergeField(events, 'timeDanger'),
+    linkStart: mergeField(events, 'linkStart'),
+    custom: mergeCustomFields(events),
+  };
+}
+
+/**
+ * Returns the shared value of a field, or the conflict symbol if the events disagree
+ */
+function mergeField<K extends BatchEditableField>(events: OntimeEvent[], field: K): MergedValue<OntimeEvent[K]> {
+  const value = events[0][field];
+  return events.some((event) => event[field] !== value) ? conflict : value;
+}
+
+/**
+ * Merges the custom fields of a list of events
+ * Fields missing from an entry are considered empty
+ */
+function mergeCustomFields(events: OntimeEvent[]): MergedCustomFields {
+  const merged: MergedCustomFields = {};
+
+  for (const event of events) {
+    for (const key of Object.keys(event.custom)) {
+      if (key in merged) {
+        continue;
+      }
+      const value = event.custom[key] ?? '';
+      merged[key] = events.some((other) => (other.custom[key] ?? '') !== value) ? conflict : value;
+    }
+  }
+
+  return merged;
+}

apps/client/src/views/countdown/CountdownSubscriptions.tsx

@@ -153,7 +153,7 @@ type ScheduleTimeProps = {
 //TODO: consider relative mode
 export function ScheduleTime(props: ScheduleTimeProps) {
   const { event, showExpected } = props;
-  const { timeStart, duration, delay, expectedStart, countToEnd } = event;
+  const { timeStart, duration, delay, expectedStart, expectedEnd } = event;
 
   const plannedStart = timeStart + delay + event.dayOffset * dayInMs;
 
@@ -164,7 +164,6 @@ export function ScheduleTime(props: ScheduleTimeProps) {
 
   const expectedStateClass = `sub__schedule--${getOffsetState(expectedStart - plannedStart)}`;
   const plannedEnd = plannedStart + duration + delay;
-  const expectedEnd = countToEnd ? Math.max(expectedStart + duration, plannedEnd) : expectedStart + duration;
   const expectedEndClass = `sub__schedule--${getOffsetState(expectedEnd - plannedEnd)}`;
 
   return (

apps/client/src/views/countdown/SingleEventCountdown.tsx

@@ -1,17 +1,15 @@
-import { MaybeNumber, OntimeEvent } from 'ontime-types';
-import { getExpectedStart } from 'ontime-utils';
+import { getExpectedEnd, getExpectedStart } from 'ontime-utils';
 import { IoPencil } from 'react-icons/io5';
 
 import Button from '../../common/components/buttons/Button';
 import useReport from '../../common/hooks-query/useReport';
 import { useFadeOutOnInactivity } from '../../common/hooks/useFadeOutOnInactivity';
 import { useExpectedStartData } from '../../common/hooks/useSocket';
-import { ExtendedEntry } from '../../common/utils/rundownMetadata';
 import { cx } from '../../common/utils/styleUtils';
 import SuperscriptTime from '../common/superscript-time/SuperscriptTime';
 import { getPropertyValue } from '../common/viewUtils';
 import { useCountdownOptions } from './countdown.options';
-import { CountdownTarget, useSubscriptionDisplayData } from './countdown.utils';
+import { CountdownEvent, CountdownTarget, useSubscriptionDisplayData } from './countdown.utils';
 import { ScheduleTime } from './CountdownSubscriptions';
 
 import './SingleEventCountdown.scss';
@@ -38,8 +36,10 @@ export default function SingleEventCountdown({ subscribedEvent, goToEditMode }:
     mode,
   });
 
+  const expectedEnd = getExpectedEnd(subscribedEvent, expectedStart, currentDay);
+
   const { endedAt } = reportData[subscribedEvent.reportId ?? subscribedEvent.id] ?? { endedAt: null };
-  const countdownEvent = { ...subscribedEvent, expectedStart, endedAt };
+  const countdownEvent = { ...subscribedEvent, expectedStart, endedAt, expectedEnd };
   const titleTmp = getPropertyValue(subscribedEvent, mainSource ?? 'title');
   const title = titleTmp?.length ? titleTmp : ' '; // insert utf-8 empty space to avoid the line collapsing;
   // while a group is live, surface the running event's title as the secondary line
@@ -64,7 +64,7 @@ export default function SingleEventCountdown({ subscribedEvent, goToEditMode }:
 }
 
 interface SubscriptionStatusProps {
-  event: ExtendedEntry<OntimeEvent> & { endedAt: MaybeNumber; expectedStart: number };
+  event: CountdownEvent;
 }
 
 function SubscriptionStatus({ event }: SubscriptionStatusProps) {

apps/client/src/views/countdown/countdown.utils.ts

@@ -12,7 +12,7 @@ import {
   isOntimeGroup,
   isPlayableEvent,
 } from 'ontime-types';
-import { MILLIS_PER_MINUTE, getExpectedStart, millisToString, removeLeadingZero } from 'ontime-utils';
+import { MILLIS_PER_MINUTE, getExpectedEnd, getExpectedStart, millisToString, removeLeadingZero } from 'ontime-utils';
 
 import { useCountdownSocket } from '../../common/hooks/useSocket';
 import { ExtendedEntry } from '../../common/utils/rundownMetadata';
@@ -197,7 +197,7 @@ export type CountdownTarget = ExtendedEntry<OntimeEvent> & {
   liveEntry?: ExtendedEntry<OntimeEvent> | null; // the running child while a group is live
 };
 
-export type CountdownEvent = CountdownTarget & { expectedStart: number; endedAt: MaybeNumber };
+export type CountdownEvent = CountdownTarget & { expectedStart: number; endedAt: MaybeNumber; expectedEnd: number };
 
 /**
  * Resolves a subscription (event or group) into an event-shaped countdown target.
@@ -271,6 +271,7 @@ export function extendEventData(
     offset,
     mode,
   });
+  const expectedEnd = getExpectedEnd(event, expectedStart, currentDay);
   const { endedAt } = reportData[event.reportId ?? event.id] ?? { endedAt: null };
-  return { ...event, expectedStart, endedAt };
+  return { ...event, expectedStart, endedAt, expectedEnd };
 }

apps/server/src/services/__tests__/timerUtils.test.ts

@@ -1126,7 +1126,7 @@ describe('getRuntimeOffset()', () => {
     } as RuntimeState;
 
     const { absolute } = getRuntimeOffset(state);
-    expect(absolute).toBe(400000); // <--- offset is always the overtime
+    expect(absolute).toBe(400000 - 200000); // <--- offset is always the overtime + added time
   });
 
   it('handles time-to-end started after the end time', () => {

apps/server/src/services/timerUtils.ts

@@ -180,13 +180,13 @@ export function getRuntimeOffset(state: RuntimeState): { absolute: number; relat
   const pausedTime = state._timer.pausedAt === null ? 0 : clock - state._timer.pausedAt;
 
   // absolute offset is difference between schedule and playback time
-  const absolute = eventStartOffset + overtime + pausedTime + addedTime;
+  // in case of count to end, the absolute offset is overtime and added time
+  const absolute = countToEnd ? overtime + addedTime : eventStartOffset + overtime + pausedTime + addedTime;
 
   // the relative offset is the same as the absolute but adjusted relative to the actual start time
   const relative = absolute + plannedStart - actualStart - _startDayOffset * dayInMs;
 
-  // in case of count to end, the absolute offset is just the overtime
-  return countToEnd ? { absolute: overtime, relative } : { absolute, relative };
+  return { absolute, relative };
 }
 
 /**

apps/server/src/stores/__tests__/runtimeState.test.ts

@@ -1036,4 +1036,167 @@ describe('loadGroupFlagAndEnd()', () => {
       eventNow: rundown.entries[0],
     });
   });
+
+  test('countToEnd entries decouple the link chain for subsequent events', () => {
+    // Event 0 (loaded): no countToEnd, linkStart=true
+    // Event 1: countToEnd=true           → breaks the link chain
+    // Event 2: linkStart=true           → unlinked (chain broken by event 1)
+    // Event 3: flag event               → also unlinked
+    const rundown = makeRundown({
+      entries: {
+        group: makeOntimeGroup({ id: 'group', entries: ['0', '1', '2'] }),
+        0: makeOntimeEvent({
+          id: '0',
+          parent: 'group',
+          timeStart: 0,
+          duration: 3600000,
+          countToEnd: false,
+          linkStart: true,
+          gap: 0,
+        } as any),
+        1: makeOntimeEvent({
+          id: '1',
+          parent: 'group',
+          timeStart: 3600000,
+          duration: 3600000,
+          countToEnd: true,
+          linkStart: true,
+          gap: 0,
+        } as any),
+        2: makeOntimeEvent({
+          id: '2',
+          parent: 'group',
+          timeStart: 7200000,
+          duration: 3600000,
+          linkStart: true,
+          gap: 0,
+        } as any),
+        3: makeOntimeEvent({
+          id: '3',
+          parent: null,
+          timeStart: 10800000,
+          duration: 3600000,
+          linkStart: true,
+          gap: 0,
+        } as any),
+      },
+      order: ['group', '0', '1', '2', '3'],
+    });
+
+    const state = {
+      groupNow: null,
+      eventNow: rundown.entries[0],
+      rundown: { actualGroupStart: null },
+    } as RuntimeState;
+
+    const metadata = { playableEventOrder: ['0', '1', '2', '3'], flags: ['3'] } as RundownMetadata;
+
+    loadGroupFlagAndEnd(rundown, metadata, 0, state);
+
+    // _group is the last event in the group (event 2)
+    // isLinkedToLoaded is false because event 1 (between loaded and group end) has countToEnd=true
+    // accumulatedGap includes event 1's duration carried forward to event 2
+    // (the countToEnd duration is applied to the next event, not the countToEnd event itself)
+    expect(state._group).toMatchObject({
+      event: rundown.entries[2],
+      isLinkedToLoaded: false,
+      accumulatedGap: 3600000,
+    });
+
+    // _flag (event 3): isLinkedToLoaded is false because chain was broken by event 1
+    // accumulatedGap is still 3600000 because event 2 is not countToEnd,
+    // so previousWasCountToEnd is null and no further duration is carried forward
+    expect(state._flag).toMatchObject({
+      event: rundown.entries[3],
+      isLinkedToLoaded: false,
+      accumulatedGap: 3600000,
+    });
+
+    // _end (event 3): also unlinked because the chain was broken at event 1
+    expect(state._end).toMatchObject({
+      event: rundown.entries[3],
+      isLinkedToLoaded: false,
+    });
+  });
+
+  test('countToEnd in the middle of the chain breaks links for downstream events', () => {
+    // Event 0 (loaded): no countToEnd, linkStart=true
+    // Event 1: linkStart=true           → linked to loaded
+    // Event 2: countToEnd=true          → breaks the chain (also last in group)
+    // Event 3: linkStart=true           → unlinked (chain broken by event 2)
+    const rundown = makeRundown({
+      entries: {
+        group: makeOntimeGroup({ id: 'group', entries: ['0', '1', '2'] }),
+        0: makeOntimeEvent({
+          id: '0',
+          parent: 'group',
+          timeStart: 0,
+          duration: 3600000,
+          countToEnd: false,
+          linkStart: true,
+          gap: 0,
+        } as any),
+        1: makeOntimeEvent({
+          id: '1',
+          parent: 'group',
+          timeStart: 3600000,
+          duration: 3600000,
+          linkStart: true,
+          gap: 0,
+        } as any),
+        2: makeOntimeEvent({
+          id: '2',
+          parent: 'group',
+          timeStart: 7200000,
+          duration: 3600000,
+          countToEnd: true,
+          linkStart: true,
+          gap: 0,
+        } as any),
+        3: makeOntimeEvent({
+          id: '3',
+          parent: null,
+          timeStart: 10800000,
+          duration: 3600000,
+          linkStart: true,
+          gap: 0,
+        } as any),
+      },
+      order: ['group', '0', '1', '2', '3'],
+    });
+
+    const state = {
+      groupNow: null,
+      eventNow: rundown.entries[0],
+      rundown: { actualGroupStart: null },
+    } as RuntimeState;
+
+    const metadata = { playableEventOrder: ['0', '1', '2', '3'], flags: ['3'] } as RundownMetadata;
+
+    loadGroupFlagAndEnd(rundown, metadata, 0, state);
+
+    // _group is the last event in the group (event 2)
+    // isLinkedToLoaded is true because no preceding event had countToEnd
+    // accumulatedGap is 0 because no preceding event was countToEnd
+    // (the countToEnd duration is carried forward to the next event, not added to the countToEnd event itself)
+    expect(state._group).toMatchObject({
+      event: rundown.entries[2],
+      isLinkedToLoaded: true,
+      accumulatedGap: 0,
+    });
+
+    // _flag (event 3): isLinkedToLoaded is false because chain was broken by count-to-end event 2
+    // accumulatedGap includes event 2's duration carried forward
+    expect(state._flag).toMatchObject({
+      event: rundown.entries[3],
+      isLinkedToLoaded: false,
+      accumulatedGap: 3600000,
+    });
+
+    // _end (event 3): unlinked because event 2 has countToEnd=true
+    expect(state._end).toMatchObject({
+      event: rundown.entries[3],
+      isLinkedToLoaded: false,
+    });
+  });
 });

apps/server/src/stores/runtimeState.ts

@@ -23,6 +23,7 @@ import {
   calculateDuration,
   checkIsNow,
   dayInMs,
+  getExpectedEnd,
   getExpectedStart,
   getLastEventNormal,
   isPlaybackActive,
@@ -831,7 +832,6 @@ function getExpectedTimes(state = runtimeState) {
   state.offset.expectedRundownEnd = null;
   state.offset.expectedGroupEnd = null;
   state.offset.expectedFlagStart = null;
-  state.offset.expectedRundownEnd = null;
 
   const { offset } = state;
   const { plannedStart, actualStart } = state.rundown;
@@ -852,7 +852,7 @@ function getExpectedTimes(state = runtimeState) {
         plannedStart,
         actualStart,
       });
-      state.offset.expectedGroupEnd = lastEventExpectedStart + lastEvent.duration;
+      state.offset.expectedGroupEnd = getExpectedEnd(lastEvent, lastEventExpectedStart, state.rundown.currentDay!);
     }
   }
 
@@ -884,7 +884,7 @@ function getExpectedTimes(state = runtimeState) {
       plannedStart,
       actualStart,
     });
-    state.offset.expectedRundownEnd = expectedStart + event.duration;
+    state.offset.expectedRundownEnd = getExpectedEnd(event, expectedStart, state.rundown.currentDay!);
   }
 }
 
@@ -927,6 +927,7 @@ export function loadGroupFlagAndEnd(
 
   let accumulatedGap = 0;
   let isLinkedToLoaded = true;
+  let previousWasCountToEnd: Maybe<number> = null;
 
   for (let idx = currentIndex; idx < playableEventOrder.length; idx++) {
     const entry = entries[playableEventOrder[idx]];
@@ -934,8 +935,23 @@ export function loadGroupFlagAndEnd(
     if (isOntimeEvent(entry)) {
       if (idx !== currentIndex) {
         // we only accumulate data after the loaded event
-        accumulatedGap += entry.gap;
-        isLinkedToLoaded = isLinkedToLoaded && entry.linkStart;
+
+        if (previousWasCountToEnd !== null) {
+          /** previous event was countToEnd: add its duration as a positive gap (it "gives back" time downstream)
+           *   and break the link to the loaded event since countToEnd events reset the schedule
+           */
+          accumulatedGap += entry.gap + previousWasCountToEnd;
+          isLinkedToLoaded = false;
+        } else {
+          accumulatedGap += entry.gap;
+          isLinkedToLoaded = isLinkedToLoaded && entry.linkStart;
+        }
+
+        if (entry.countToEnd) {
+          previousWasCountToEnd = entry.duration;
+        } else {
+          previousWasCountToEnd = null;
+        }
 
         // and the loaded event is not allowed to be the next flag
         if (!foundFlag && metadata.flags.includes(entry.id)) {

e2e/tests/features/215-multi-edit.spec.ts

@@ -0,0 +1,87 @@
+import { expect, test } from '@playwright/test';
+
+test('Editing multiple events', async ({ page }) => {
+  await page.goto('/editor');
+  await page.getByRole('button', { name: 'Edit' }).click();
+
+  // clear rundown
+  await page.getByRole('button', { name: 'Rundown menu' }).click();
+  await page.getByRole('menuitem', { name: 'Clear all' }).click();
+  await page.getByRole('button', { name: 'Delete all' }).click();
+
+  // create two events with distinct titles
+  await page.getByRole('button', { name: 'Create Event' }).click();
+  await page.getByRole('button', { name: 'Event', exact: true }).nth(1).click();
+  await expect(page.getByTestId('rundown-event')).toHaveCount(2);
+
+  await page.getByTestId('entry-1').getByTestId('entry__title').fill('first');
+  await page.getByTestId('entry-1').getByTestId('entry__title').press('Enter');
+  await page.getByTestId('entry-2').getByTestId('entry__title').fill('second');
+  await page.getByTestId('entry-2').getByTestId('entry__title').press('Enter');
+
+  const editor = page.getByTestId('editor-container');
+
+  // a single selection shows the full schedule and the event id
+  await page.getByTestId('entry-1').getByTestId('rundown-event').click();
+  await expect(editor.getByTestId('time-input-timeStart')).toBeVisible();
+  await expect(editor.getByLabel('Title', { exact: true })).toHaveValue('first');
+
+  // selecting both events shows a merged view
+  await page
+    .getByTestId('entry-2')
+    .getByTestId('rundown-event')
+    .click({ modifiers: ['Shift'] });
+  await expect(editor.locator('#eventId')).toHaveValue('2 events selected');
+  await expect(editor.getByText('Automations are not available when editing multiple events')).toBeVisible();
+
+  // start and end times are unique to an event, only the duration can be batched
+  await expect(editor.getByTestId('time-input-timeStart')).toBeHidden();
+  await expect(editor.getByTestId('time-input-timeEnd')).toBeHidden();
+  await expect(editor.getByTestId('time-input-duration')).toBeVisible();
+
+  // fields which do not agree are shown as mixed
+  const title = editor.getByLabel('Title', { exact: true });
+  await expect(title).toHaveValue('');
+  await expect(title).toHaveAttribute('placeholder', 'Mixed');
+
+  // leaving a mixed field without editing it does not overwrite the events
+  await title.click();
+  await page.keyboard.press('Tab');
+  await expect(page.getByTestId('entry-1').getByTestId('entry__title')).toHaveValue('first');
+  await expect(page.getByTestId('entry-2').getByTestId('entry__title')).toHaveValue('second');
+
+  // a mixed field cannot be cleared by emptying it, so an explicit action is offered
+  const clearTitle = editor.getByRole('button', { name: 'Clear', exact: true }).first();
+  await expect(clearTitle).toBeVisible();
+  await clearTitle.click();
+  await expect(page.getByTestId('entry-1').getByTestId('entry__title')).toHaveValue('');
+  await expect(page.getByTestId('entry-2').getByTestId('entry__title')).toHaveValue('');
+
+  // the events now agree, so the field can be cleared by hand and the action is withdrawn
+  await expect(editor.getByLabel('Title', { exact: true })).not.toHaveAttribute('placeholder', 'Mixed');
+
+  // editing a field applies it to the whole selection
+  await title.fill('shared title');
+  await title.press('Enter');
+  await expect(page.getByTestId('entry-1').getByTestId('entry__title')).toHaveValue('shared title');
+  await expect(page.getByTestId('entry-2').getByTestId('entry__title')).toHaveValue('shared title');
+
+  // the value is no longer mixed
+  await expect(editor.getByLabel('Title', { exact: true })).toHaveValue('shared title');
+
+  // a batched duration is applied to every event and the rundown is recalculated once
+  const duration = editor.getByTestId('time-input-duration');
+  await duration.click();
+  await duration.fill('5m');
+  await duration.press('Enter');
+  await expect(page.getByTestId('entry-1').getByTestId('time-input-duration')).toHaveValue('00:05:00');
+  await expect(page.getByTestId('entry-2').getByTestId('time-input-duration')).toHaveValue('00:05:00');
+  // the second event is linked, so its start follows the new end of the first
+  await expect(page.getByTestId('entry-2').getByTestId('time-input-timeStart')).toHaveValue('00:05:00');
+  await expect(page.getByTestId('entry-2').getByTestId('time-input-timeEnd')).toHaveValue('00:10:00');
+
+  // going back to a single selection restores the full editor
+  await page.getByTestId('entry-1').getByTestId('rundown-event').click();
+  await expect(editor.getByTestId('time-input-timeStart')).toBeVisible();
+  await expect(editor.locator('#eventId')).not.toHaveValue('2 events selected');
+});

packages/utils/index.ts

@@ -80,7 +80,7 @@ export { validateEndAction, validateTimerType } from './src/validate-events/vali
 
 // feature business logic
 
-export { getExpectedStart } from './src/date-utils/getExpectedStart.js';
+export { getExpectedStart, getExpectedEnd } from './src/date-utils/getExpected.js';
 
 // feature business logic - rundown
 export { checkIsNow } from './src/date-utils/checkIsNow.js';

packages/utils/src/date-utils/getExpected.test.ts

@@ -1,7 +1,7 @@
 import { Day, OffsetMode } from 'ontime-types';
 
 import { MILLIS_PER_HOUR, dayInMs } from './conversionUtils';
-import { getExpectedStart } from './getExpectedStart';
+import { getExpectedEnd, getExpectedStart } from './getExpected';
 
 describe('getExpectedStart()', () => {
   describe('Absolute offset mode', () => {
@@ -315,3 +315,144 @@ describe('getExpectedStart()', () => {
     expect(getExpectedStart(testEvent, { ...testState, currentDay: 0 })).toBe(23 * MILLIS_PER_HOUR + 5);
   });
 });
+
+describe('getExpectedEnd()', () => {
+  const baseState = {
+    currentDay: 0,
+    totalGap: 0,
+    mode: OffsetMode.Absolute,
+    actualStart: null,
+    plannedStart: null,
+    isLinkedToLoaded: true,
+  };
+
+  test('a regular event ends at its expected start plus duration', () => {
+    const testEvent = {
+      timeStart: 100,
+      duration: 50,
+      delay: 0,
+      dayOffset: 0 as Day,
+      countToEnd: false,
+    };
+
+    // on schedule
+    const expectedStart0 = getExpectedStart(testEvent, { ...baseState, offset: 0 });
+    expect(getExpectedEnd(testEvent, expectedStart0, baseState.currentDay)).toBe(150);
+
+    // running 20 behind pushes the end out
+    const expectedStart20 = getExpectedStart(testEvent, { ...baseState, offset: 20 });
+    expect(getExpectedEnd(testEvent, expectedStart20, baseState.currentDay)).toBe(170);
+  });
+
+  test('a countToEnd event pins to the planned end while in overtime', () => {
+    const testEvent = {
+      timeStart: 100,
+      duration: 50,
+      delay: 0,
+      dayOffset: 0 as Day,
+      countToEnd: true,
+    };
+
+    // overtime would otherwise push the end to 170, but countToEnd absorbs it and pins to 150
+    const expectedStart = getExpectedStart(testEvent, { ...baseState, offset: 20 });
+    expect(getExpectedEnd(testEvent, expectedStart, baseState.currentDay)).toBe(150);
+  });
+
+  test('an overnight countToEnd event returns a normalised end', () => {
+    // event starts at 23:00 and counts to 01:00 the next day -> duration spans midnight
+    const timeStart = 23 * MILLIS_PER_HOUR;
+    const duration = 2 * MILLIS_PER_HOUR;
+    const testEvent = {
+      timeStart,
+      duration,
+      delay: 0,
+      dayOffset: 0 as Day,
+      countToEnd: true,
+    };
+
+    const expectedStart = getExpectedStart(testEvent, { ...baseState, offset: 0 });
+    expect(getExpectedEnd(testEvent, expectedStart, baseState.currentDay)).toBe(timeStart + duration);
+  });
+
+  test('a countToEnd event ignores upstream delays and stays pinned to its fixed end', () => {
+    const testEvent = {
+      timeStart: 100,
+      duration: 50,
+      delay: 20,
+      dayOffset: 0 as Day,
+    };
+
+    // events shift their schedule based on delay...
+    const expectedStart = getExpectedStart({ ...testEvent }, { ...baseState, offset: 0 });
+    expect(getExpectedEnd({ ...testEvent, countToEnd: false }, expectedStart, baseState.currentDay)).toBe(170);
+
+    // ... but count to end events stay pinned to the scheduled end
+    const expectedStartCountToEnd = getExpectedStart({ ...testEvent }, { ...baseState, offset: 0 });
+    expect(getExpectedEnd({ ...testEvent, countToEnd: true }, expectedStartCountToEnd, baseState.currentDay)).toBe(150);
+  });
+
+  test('a countToEnd event drifts when a delay pushes its start past the fixed end', () => {
+    const testEvent = {
+      timeStart: 100,
+      duration: 50,
+      delay: 60,
+      dayOffset: 0 as Day,
+      countToEnd: true,
+    };
+
+    // the delayed start (160) is past the fixed end (150), so the event can no longer
+    // finish on time and the end follows the compromised start
+    const expectedStart = getExpectedStart(testEvent, { ...baseState, offset: 0 });
+    expect(getExpectedEnd(testEvent, expectedStart, baseState.currentDay)).toBe(160);
+  });
+
+  test('a countToEnd event on a later day keeps the day offset on the end', () => {
+    const testEvent = {
+      timeStart: 100,
+      duration: 50,
+      delay: 0,
+      dayOffset: 1 as Day,
+      countToEnd: true,
+    };
+
+    // the scheduled end must include the day offset (timeStart + dayInMs + duration),
+    // not collapse to the day-shifted start
+    const expectedStart = getExpectedStart(testEvent, { ...baseState, currentDay: 0, offset: 0 });
+    expect(getExpectedEnd(testEvent, expectedStart, baseState.currentDay)).toBe(150 + dayInMs);
+
+    // when the running event is already on the same day, no extra day is added
+    const expectedStartSameDay = getExpectedStart(
+      { ...testEvent, dayOffset: 0 as Day },
+      { ...baseState, currentDay: 0, offset: 0 },
+    );
+    expect(getExpectedEnd({ ...testEvent, dayOffset: 0 as Day }, expectedStartSameDay, baseState.currentDay)).toBe(150);
+  });
+
+  test('a countToEnd event is anchored to its wall-clock end in relative mode', () => {
+    const testEvent = {
+      timeStart: 100,
+      duration: 50,
+      delay: 0,
+      dayOffset: 0 as Day,
+      countToEnd: true,
+    };
+
+    const relativeState = {
+      ...baseState,
+      mode: OffsetMode.Relative,
+      actualStart: 30,
+      plannedStart: 0,
+      offset: 0,
+    };
+
+    // a regular event in the same state is shifted by the relative-start offset to 180
+    const expectedStartRegular = getExpectedStart({ ...testEvent }, relativeState);
+    expect(getExpectedEnd({ ...testEvent, countToEnd: false }, expectedStartRegular, relativeState.currentDay)).toBe(
+      180,
+    );
+
+    // the countToEnd event stays pinned to its wall-clock end (150), not shifted
+    const expectedStartCountToEnd = getExpectedStart(testEvent, relativeState);
+    expect(getExpectedEnd(testEvent, expectedStartCountToEnd, relativeState.currentDay)).toBe(150);
+  });
+});

packages/utils/src/date-utils/getExpected.ts

@@ -3,15 +3,6 @@ import { OffsetMode } from 'ontime-types';
 
 import { dayInMs } from './conversionUtils.js';
 
-/**
- * @param event the event that we are counting to
- * @param currentDay the day offset of the currently running event
- * @param totalGap accumulated gap from the current event
- * @param isLinkedToLoaded is this event part of a chain linking back to the current loaded event
- * @param clock
- * @param offset
- * @returns
- */
 export function getExpectedStart(
   event: Pick<OntimeEvent, 'timeStart' | 'dayOffset' | 'delay'>,
   state: {
@@ -60,3 +51,25 @@ export function getExpectedStart(
   const offsetStartTimeBufferedByGaps = offsetStartTime - totalGap;
   return offsetStartTimeBufferedByGaps;
 }
+
+export function getExpectedEnd(
+  event: Pick<OntimeEvent, 'timeStart' | 'dayOffset' | 'duration' | 'countToEnd'>,
+  expectedStart: number,
+  currentRuntimeDay: number,
+): number {
+  /**
+   * Count to end events are a special case
+   * - the end time is always the wall clock
+   */
+  if (event.countToEnd) {
+    // account for day offset
+    const relativeDayOffset = event.dayOffset - currentRuntimeDay;
+    const plannedEnd = event.timeStart + event.duration + relativeDayOffset * dayInMs;
+
+    // count to end should finish on the planned time or on start
+    return Math.max(expectedStart, plannedEnd);
+  }
+
+  // for normal events, the expected end is when we would start + its duration
+  return expectedStart + event.duration;
+}