Sam Atkins 6c572006a3 LibGUI+ThemeEditor: Split preview-widget palette-change callback ...

There are two different things in ThemeEditor that want to know when a
palette changes:
1. The PreviewWidget subclass, so it can update its preview.
2. The ThemeEditor itself, so we know that the palette is modified.

Using a protected virtual function for 1 means that we can do 2 without
them fighting over the same on_palette_change callback.

2022-04-29 20:06:39 +02:00

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