changing screen positions caused one display to become unreadable/unusable

[guiverc]

Expected behaviour

I expect the Monitor.Preferences to show show ghost-images, and clicking APPLY I expect the display orientation to adjust to the changed setup, and both displays to be readable, static & usable.

Actual behaviour

On dragging one relative to the other, the Monitor.Preferences image is showing a trail of where it was dragged like solitaire years ago (on another OS) when you 'won'.. Not expected

See https://launchpadlibrarian.net/559766825/Screenshot%20at%202021-09-23%2003-53-48.png

Steps to reproduce the behaviour

My display setup is strange (one monitor above the other), so using the Displays area of Ubuntu-MATE Control Center to adjust, I drag the location of one relative to the other to where it should be for my setup.

-- all that's needed is to drag one monitor (two displays) around monitor.preferences window; if bug occurs you'll see it

the issue has occurred on different boxes though

• hp 8200 elite sff (i5-2400, 8gb, nvidia quadro 600)
  -dell [optiplex] 780 (c2q-q9400, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)

I'm convinced I've filed it on prior releases on LP

MATE general version

1.26.0

Package version

mate-control-center 1.26.0-0ubuntu1

Linux Distribution

Ubuntu-MATE 21.10 & jammy (2021-12-20 last QA-test as I filed this)

Link to bugreport of your Distribution (requirement)

https://bugs.launchpad.net/ubuntu/+source/mate-control-center/+bug/1944661
(most pictures are included on LP bug report)

related also is https://bugs.launchpad.net/ubuntu/+source/ubuntu-mate-meta/+bug/1934752

(given I've (just NOW) found two - one will be marked duplicate)

[guiverc]

This is a duplicate of #673 (which was marked a duplicate of #273)

Sorry I'm processing email in order.. and thus hadn't see the connections yet...