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To recreate this issue:
1. Add view A as a subview to view B
2. Put mouse over view A
3. Remove view A from its superview
4. When you move your mouse now, view A still gets a mouseExited event
Will be fixed when CPTrackingArea is implemented.
Milestone: 1.0. Labels: #accepted, #needs-patch, AppKit, bug. What's next? This issue needs a volunteer to write and submit code to address it.