* GeoPos: pan continuously across 0 deg lat/lon (#3317)
The DMS coordinate fields store an unsigned magnitude with the sign in a
separate hemisphere field (#3283). That made (-1, 0) representable but
left interactive panning unable to cross 0: at magnitude zero the minute/
degree carry clamps instead of flipping the hemisphere, so a 1-degree band
along the equator and the Greenwich meridian is skipped by the wheel.
Route each DMS field's encoder through a signed arcsecond model: a turn
moves the coordinate along the number line, and the hemisphere flip plus
magnitude reflection fall out of one set of fields being rewritten. E.g.
0 deg 0' 42" E minus one minute now gives 0 deg 0' 18" W as expected.
The old per-field on_wrap carry handlers are removed; the fields no longer
apply the turn locally.
* Correct latitude adjustment reporting logic
Fix adjustment logic to only report position if latitude changes.
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
* GeoPos: apply the clamp-report guard to longitude too
The latitude fix (Copilot review) left adjust_lon() reporting a pan even
when set_lon_arcseconds() clamped at +-180 deg and changed nothing. Guard
it the same way: report only when the signed arcseconds actually changed.
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Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
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