widget: Queue resize on parent on show/hide
widget: Queue resize on parent on show/hide

When gtk_widget_show() or gtk_widget_hide() is called, don't queue a
resize on the widget itself but on the parent.

The widget itself may already be marked as in need of a resize and
the call would be optimized out and never reach the parent.
The parent size will change though because a child widget just changed
its visibility.

Fixes a bunch of issues with menus appearing black, toolbas not hiding
in widget-factory and also various reftests.

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