Handle lostpointercapture as well#8696
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Pull request overview
This PR updates the KeyboardMouseSource input handling to also treat lostpointercapture as a “pointer up”-equivalent, preventing stuck/missing mouse button state when pointer capture is lost (e.g., due to focus changes involving an iframe parent).
Changes:
- Add a
lostpointercaptureevent listener that routes into the existing_onPointerUpcleanup logic. - Ensure the listener is correctly removed on
detach()to avoid leaks / duplicate handlers.
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Otherwise pointer up events go missing when focus is on an iframe parent.