Exclusive zone does not scale on Wayland

[stefonarch]

Screenshot with 3 panels and global scale factor 2:

Expected Behavior

Maximized windows go not behind panel

Current Behavior

They do with scaling >1

Possible Solution

Scale exclusive zone value accordingly.

Steps to Reproduce (for bugs)

1. Set a scale value like 1.2 or more
2. Restart session
3. Maximize any window

System Information

• LXQt Version: 2.0, git

[tsujan]

Apparently LayerShellQt::Window::setExclusiveZone doesn't follow QT_SCALE_FACTOR.

We can wait for a fix in layer-shell-qt, or we can add a workaround, but if we add a workaround, it'll cause the inverse problem when the original issue is fixed.

[stefonarch]

There are more issues: any applications like lxqt-leave or qterminal -d don't scale at all if launched by shortcut, as do most xwayland windows too (element looks ok, gimp not).
Using wdisplays or kanshi for setting the scale factor has no issues at all.

[tsujan]

Using wdisplays or kanshi for setting the scale factor has no issues at all.

That's how it should be done on Wayland. QT_SCALE_FACTOR works fine only on X11. I'm not saying that we should disable it in LXQt Session Settings under Wayland, but adding a tooltip may be a good idea (also because of lxqt/lxqt-session#541 (comment)).

[tsujan]

As we know now, LXQt global scaling shouldn't be used under Wayland.