Andreas Kling e74f32ae40 LibGUI: Always invalidate layout on GWidget child removal. ...

This code can get a bit confused when the child is destroyed before we
handle the ChildRemoved event. In those cases, the GChildEvent::child()
getter will return nullptr as it's backed by a WeakPtr.

To work around this issue, just always invalidate the layout for now.
This can be made a lot tighter in the future.

2019-04-06 21:15:13 +02:00

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