get_height_for_width, subclasses now have to provide their own
implementation if they need height-for-width functionality.
+* Widget state propagation has been changed. Historically, all of
+ active, prelight, selected, insensitive, inconsistent and backdrop
+ have been propagated to children. This has now been restricted
+ to just the insensitive and backdrop states. This mostly affects
+ theming.
+
Release notes for 3.8
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