Cannot change display layout before applying changes to one monitor
When modifying a display in a multi-display setup, one needs to go into a sub-page. At this point, the Apply/Cancel buttons are shown, making it impossible to adjust the layout after e.g. disabling a monitor.
This is bad. It is actually really bad, because it might result in an invalid display layout that cannot be applied without first moving around the displays in the overall arrangement.
Two possible solutions:
- Also show the back button
- Only show the back button, and require going back to the main screen to apply
This regressed when the monitor configuration was moved into sub-pages.