[Bug 1945075] [NEW] wayland: is not possible to setup several displays

[DimanNe]

Public bug reported:

I decided to try wayland and got several issues, in the order of
(subjective) importance:

================================================================
### Issue 1

I have two monitors, one of which is rotated 90 degrees, so I tried to set them up in wayland session (as I did in X). You can see on the screenshot "wayland_display_settings.jpg" that I specified that it is rotated and pressed "Apply", and one of them *is* rotated on the preview.
However, you can see that actual content on that display is not rotated.
Also, note where the task panel is located on the first display - it is in the centre of the screen.

Just in case, here is xrand command I am using in X:
xrandr --output DP-2 --mode 3840x2160 --pos 0x790 --scale 1.1875x1.1875 \
       --output DP-0 --mode 3840x2160 --pos 4560x0 --rotate left --primary


================================================================
### Issue 2

It looks like some options are missing. In X, there are:
   * "Replica of: None" option, which disables duplicating of image.
   * "Primary" checkbox, which removes panel from secondary display.
but there are not such options in Wayland.


================================================================
### Issue 3

Scaling deteriorates sharpness, makes thin lines blurry. See screenshot
of Krusader 125scale_vs_100scale.png. Thin lines become blurry.


I was using this short guide to setup Wayland:
https://community.kde.org/Plasma/Wayland/Nvidia

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: kwin-wayland 4:5.22.5-0ubuntu1
ProcVersionSignature: Ubuntu 5.13.0-16.16-generic 5.13.13
Uname: Linux 5.13.0-16-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu69
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sat Sep 25 22:41:55 2021
InstallationDate: Installed on 2021-01-30 (238 days ago)
InstallationMedia: Kubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
SourcePackage: kwin
UpgradeStatus: Upgraded to impish on 2021-09-25 (0 days ago)

** Affects: kwin (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug impish third-party-packages

** Attachment added: "wayland_display_settings.jpg"
   https://bugs.launchpad.net/bugs/1945075/+attachment/5528041/+files/wayland_display_settings.jpg

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Title:
  wayland: is not possible to setup several displays

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