Andreas Kling c56c8c8953 WindowServer: Remove applets from AppletManager on client disconnection ...

Disconnecting from WindowServer without explicit calls to DestroyWindow
would leave nulled-out WeakPtr's in the AppletManager applet list.

This led to a null dereference when adding a new applet, since we were
assuming the list contained no nulled-out applets.

This patch fixes the issue by always unregistering applet windows from
the AppletManager in ~ClientConnection(). We also do an extra pass of
pruning any nulled-out WeakPtrs from the applet list when adding to it.

Fixes #1551.

2020-03-31 13:55:28 +02:00

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