When docking an area into a portion of another area, the target area is
split. Currently the new section shows an icon that is bold and
outlined, while the remaining area shows a dimmed icon. This dimming
doesn't make a lot of sense since it is not closed, and it is easy
to tell the source from target with other clues. Conversely, dimming
the icon makes it harder to tell what is going on. This PR just makes
both icons show at the same opacity.
Pull Request: https://projects.blender.org/blender/blender/pulls/125199
1404a95dde