7215da9390
When resizing area, outline flickering is caught occassionally. Border edge is not identified sometimes which doesn't set `active_area` to null. This eventually draws outline with `TH_EDITOR_OUTLINE_ACTIVE` color. When moving editors, always set `active_area` ptr as null to eliminate jumping between two theme colors. Pull Request: https://projects.blender.org/blender/blender/pulls/136487