Andreas Kling b00a347ac5 LibGUI: Protect GUI::Button across firing the on_click hook ...

If a hook triggers the deletion of the GUI::Button, we would be unable
to proceed in a well-defined manner here, so let's protect ourselves.

This probably needs to be done in a whole lot of places, since GUI
widgets are just ref-counted Core::Objects and running arbitrary code
can mean that they get deleted.

2020-12-14 20:43:42 +01:00

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