This allows us to asynchronously load items into the menu, see
cf98518055. All menus spawned from Python using the `wm.call_menu`
operator will be affected by this. We could avoid that and only refresh
the menu we need to, but it's worth trying to get this to work as a
general menu feature.
This is a slightly risky change, so keeping an eye open for bugs.
When calling `wm.call_menu_pie` and `wm.call_menu`, the menu context
was ignored when showing its name in the header or pie menu center.
Reviewed By: mont29
Differential Revision: https://developer.blender.org/D16195
When labels in popups (typically headings) matched the name of a button,
the label would be activated instead of the button.
This caused the unwrap menu in the UV editor not to re-select "Unwrap"
when opening a second time.
Moves all `interface_region*` files to C++ except for the tooptip region
which is slightly more complicated. Also move a few other files as well.
This helps to simplify and speed up code, especially through the use
of better C++ data structures. This change builds on all platforms on
the buildbot.
