Crash after closing a tooltip's Popup directly (#5932) #6080
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Fixes #5730
Description
Closing a tooltip's Popup directly (as opposed to closing the ToolTip and letting WPF close the Popup in response) causes WPF to clear some private state on the ToolTip while leaving its IsOpen=true. When the ToolTip is eventually closed, WPF uses that state and crashes because it's null.
Fixed by preserving the private state until the ToolTip itself is closed, and adding logic to ensure that the state is cleared even if the Popup was already closed before the ToolTip closed.
Customer Impact
Fixes a regression.
Regression
Yes.
Testing
Risk
Low. The fix itself is safe. The customer reports did not include repros, so there's a small risk that there are crashing scenarios that this fix doesn't address.