Settings gains an optional window_geometry field (size + position)
serialized via #[serde(default)] so legacy settings.json files without
the field deserialize cleanly to None. On launch the app restores
the persisted dimensions and position; first run and pre-upgrade
saves keep the existing 1280x800 centered default.
settings_plugin records changes from WindowResized and WindowMoved
into a PendingWindowGeometry resource and writes them to disk through
the existing atomic .tmp+rename path once the events have stayed
quiet for WINDOW_GEOMETRY_DEBOUNCE_SECS (0.5s). A merge_geometry
helper preserves whichever component (size or position) the latest
event burst didn't carry, so a position-only WindowMoved never wipes
the recorded size.
Pure should_persist_geometry and merge_geometry helpers are unit
tested for the boundary cases. Headless integration tests cover the
full flow: a single resize event then a quiet window persists, a
move event after a resize updates only position, a rapid storm
collapses to the final size, and a quiet frame with no events
leaves the geometry untouched.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
funman300
6e7705b256