Pointer Focus Registration Code Info

occurs when pointer focus registers and releases multiple times within a single frame—usually due to overlapping transparent hitboxes or async layout recalculations.

: Log WM_MOUSEENTER and WM_MOUSELEAVE with timestamps. If you see >2 pairs in <50ms, you have dribble. A Safer Registration Contract (Pseudocode) After years of debugging corrupted focus states, I’ve landed on a simple contract for any register_pointer_focus() implementation: pointer focus registration code

# 5. Post-condition: event ownership is unambiguous assert system.pointer_focus == candidate occurs when pointer focus registers and releases multiple