Display overlaps another display when disabling Mirror Mode or a monitor #424

What Happened?

Display widgets overlaps one each other if I disable Mirror (Clone) Mode or a monitor. It may occurs because:

• Mutter DisplayConfig interface doesn't return monitor layouts with disabled monitors;
• Cloned monitors always has coordinates x = 0; y = 0.

Display transformation seems to be affected too.

Steps to Reproduce

1. Open Display Settings when using two or more monitors
2. Disable a monitor or enable then disable Mirror Mode
3. Watch Display Widgets overlaping each other

Expected Behavior

• When disabling Mirror Mode, display settings should restore previous Display Layout state
• When disabling a monitor, display settings should keep Display Layout without changing it

OS Version

8.x (Circe)

Session Type

Classic and Secure Sessions (I have tested in both)

Software Version

Latest release (I have run all updates)

Log Output

Hardware Info

No response