Matt Jacobson 037fbbf5d9 LibGUI: Add existing children widgets when layout manager changed ...

If a widget gains a layout manager after it already has child widgets,
the existing widgets are unknown to the layout.  Additionally, if a
layout is reused, it may end up managing children of multiple different
widgets.

To simplify this, clear the entries of a layout manager when its owner
changes, and add any existing children when a new owner comes along.

2022-01-12 11:49:17 +01:00

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