With #144591 it was not my intent to increase the width of the right-
side corner action zones when visible "Corner Handles" are enabled. It
is only the left side that gains the icon so making the right side
wider only interferes with other content. This PR just fixes this by
defining different widths for right versus left zones.
Pull Request: https://projects.blender.org/blender/blender/pulls/148076
8b726ad83d