Fix stale pointer hover during macOS live resize - #4681
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September 5, 2026 15:06
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September 5, 2026 16:28
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Bug:
During native macOS window resizing, AppKit can take ownership of the mouse without delivering
mouseExited:or furthermouseMoved:events to the content view. Applications that retain the last pointer position continue hit-testing it during resize redraws.In an egui application with a responsive tab bar in the above GIF, expanding the right edge consequently highlights earlier tabs and opens their tooltips while the real pointer remains at the window edge.
Attached is a pure winit/AppKit demo that also reproduces the bug in the latest winit master: winit-hover-resize.zip
Fix:
Emit
PointerLeftwhen live resizing starts and suppress incidental pointer entry/motion until it ends. At the end, samplemouseLocationOutsideOfEventStream, convert into view/backing coordinates, and emitPointerEnteredfollowed byPointerMovedif the pointer is inside the current view bounds.Request redraws at both transitions so hover state can update without another mouse movement.