The loading mouse filter (should_drop_loading_mouse_motion) dropped all
Drag events while app.is_loading unless a transcript selection or
scrollbar drag was active. A sidebar resize started on the handle
(Down passes the filter) then never received its Drag events, leaving
the resize wedged mid-gesture during live runs (#3063, symptom of the
#3096 subagent-runtime pressure on the TUI).
- Allow Drag events through the loading filter while
app.sidebar_resizing is set.
- Clear last_sidebar_area / last_sidebar_handle_area and any in-flight
resize when the sidebar is hidden or doesn't fit, so stale handle
hit-areas can't capture clicks.
- Tests: resize down/drag/up while loading, mouse-up outside the
handle still ends the resize.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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