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Using Ubuntu 22.04 (very recent fresh installation)

QT applications use X11 by default instead of Wayland. This leads to
incomplete menus and all sorts of graphical glitches. The workaround is
to add export QT_QPA_PLATFORM=wayland to .profile. As for the mouse
cursor, they don't use the current mouse cursor size (which is instead
huge). A google search of "mouse cursor too big on Ubuntu" yields quite
a few results, signalizing that the issue affects multiple users. A
workaround is to add export XCURSOR_SIZE="$(gsettings get
org.gnome.desktop.interface cursor-size)" to .profile. The mouse cursor
theme is also not respected. Instead, a white mouse cursor is what I see
in QT applications. A workaround is to add export XCURSOR_THEME=Yaru to
.profile (export XCURSOR_THEME="$(gsettings get
org.gnome.desktop.interface cursor-theme)" doesn't work, even though
executing gsettings get org.gnome.desktop.interface cursor-theme in the
terminal returns 'Yaru'). Trying to investigate the matter as to why
this happens, I found at least something relevant regarding the mouse
cursor theme: the file x-cursor-theme in etc/alternatives had the lines

[Icon Theme]
Inherits=DMZ-White

which is strange because the default mouse cursor theme is Yaru nowadays
and not DMZ-White. However, DMZ-White seems to have been the default in
the past (I might be wrong on this), suggesting that those lines are a
relic of older Ubuntu versions. Changing the above DMZ-White to Yaru
(and deleting the corresponding line in .profile) solves the issue as
well (presumably now for all users on this machine).

These commands, or an equivalent configuration, should be the default
(it's not clear why QT applications are not supposed to use the default
environment). Regarding mouse cursor I would also add: when opening a QT
application without having done any of the above, the mouse cursor
doesn't change. It only happens when the app is made to run using
Wayland that the mouse cursor changes. The right top buttons of the
window (close, maximize, minimize) also change to a different, "retro"
design with Wayland (not with X11, despite all the other glitches),
which is clearly not Yaru or even Adwaita.

A standard Ubuntu installation, even though it comes with GNOME, should
expect users to install QT based applications at some point. They should
use Wayland and use the default mouse cursor size and theme with no
manual intervention by the user.

** Affects: qtbase-opensource-src (Ubuntu)
     Importance: Undecided
         Status: New

-- 
QT applications don't respect environment or mouse cursor
https://bugs.launchpad.net/bugs/2002450
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