Blender Git Loki

Fix menu poll function being ignored for UILayout.menu

Using `UILayout.menu()` [1] or `UILayout.menu_contents() [2], the menu
would just always be added, the `poll()` check not being executed. As
API user I would expect the `poll()` to deterimine visiblity of the
menu.

[1] https://docs.blender.org/api/current/bpy.types.UILayout.html#bpy.types.UILayout.menu
[2] https://docs.blender.org/api/current/bpy.types.UILayout.html#bpy.types.UILayout.menu_contents

Differential Revision: https://developer.blender.org/D12053

Reviewed by: Campbell Barton