Move camera pointer, framebuffer resize, and retained/devtools input edges behind focused reversible owners. Preserve input priority while making shutdown deactivate callbacks before live-session retirement and retry physical detach without stranding transport teardown.
Visual test of the B.4b handler revealed the dispatcher never fired
SelectDblLeft. OnMouseDown was only looking up Press and Hold
activations — DoubleClick bindings in KeyBindings.cs were effectively
dead code.
Adds 500ms-threshold double-click detection: tracks last-mouse-down
button + Environment.TickCount64 timestamp; a same-button press within
the threshold additionally fires ActivationType.DoubleClick for the
matching binding (Press still fires normally for the second click).
Clears the pair-state after firing so a triple-click doesn't produce
a second DoubleClick.
Tests cover same-button within threshold, beyond threshold (no fire),
different-button (no fire), and triple-click (fresh pair required).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
