Help required to determine why some packages are being installed

[Lisandro Damián Nicanor Pérez Meyer <perezmeyer@gmail.com>]

Hi!

tl;dr: we the Qt maintainers need help to find out why some users
upgrading from stable / reinstalling packages get libqt5quick5-gles
instead of libqt5quick5.

Long story: some months ago my team mate Dmitry Shachnev managed to
get two flavours of Qt: the normal one with OpenGL support and the new
one with GLES support.

  https://mitya57.me/weblog/2020/01/qt-opengl-es-packages-available.html

  (If you care about the details I strongly recommend reading the
above blog post)

So most packages now have an alternative dependency like libqt5gui5
(>= 5.x) | libqt5gui5-gles (>= 5.x). The strange thing is that *some*
users upgrading from stable or reinstalling packages [1] get the -gles
variant instead of the non-gles one by default. This causes bugs like
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=976389

So far we couldn't reproduce the issue so we are kindly asking for
your help in order to determine what's causing this behavior.

Thanks in advance, Lisandro.

[1] There are some other cases in
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=976389#10

-- 
Lisandro Damián Nicanor Pérez Meyer
http://perezmeyer.com.ar/
http://perezmeyer.blogspot.com/