When a menu is open, moving your mouse to a neighboring menu can cause
that menu to open, closing the open one. This is very problematic when
the open menu is very wide because users are likely to travel over
other menus while moving toward items in far columns. Typically this is
the "change area" menu, but this can happen with any wide menu. This PR
just checks the menu width and turns off this feature when it is wide.
Pull Request: https://projects.blender.org/blender/blender/pulls/136528
110b8fee41