Andreas Kling b615a5c780 LibGUI: Add a way for GWidgets to do custom layout on child hide/show ...

This solves an issue in GScrollableWidget where hiding one of the two
scrollbars needs to trigger a relayout since the other one should grow
into the "shared space" in the bottom right corner.

A GWidget can now override custom_layout() which will be called at any
time we would normally delegate work to the GLayout, e.g on resize
or child visibility changes, size policy changes, etc.

2019-09-01 20:51:20 +02:00

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