Add short paragraph on Qt troubleshooting

[aknierim]

This adds an instruction on how to fix the

qt.qpa.plugin: Could not find the Qt platform plugin "wayland" in ""

error that one may encounter when executing %matplotlib in an ipython shell. I have encountered this several times now on devices using the WSL2 (hence why I only added this to the Win10/11 instructions).

The fix that worked most of the times is adding

export QT_QPA_PLATFORM=xcb

to the .bashrc/.zshrc, thus setting the Qt platform to run on an X11 server.

[maxnoe]

Is this really the correct solution?

I think it would be preferred to use Wayland in the WSL setup, right?

So installing mamba install qt-wayland should be the better fix?

[aknierim]

Is this really the correct solution?

Well it is one solution... Or at least the easiest.

I think it would be preferred to use Wayland in the WSL setup, right? So installing mamba install qt-wayland should be the better fix?

The problem is that that would require people to install qt-wayland in every environment they create, which I know for certain will rarely happen...

[SepplL]

Given that many of the major Linux distros also move to Wayland more and more (supported by both gnome and KDE massively moving in that direction as well) applying a fix to stay on legacy code could present not being the best solution here. Is there no way of fixing the whole wsl2 issue with Wayland as a whole? Maybe by installing xwayland or something similar from the distro's package manager?

[aknierim]

Is there no way of fixing the whole wsl2 issue with Wayland as a whole?

None that I have found so far... I also can confirm now that, at least in one case I know of, installing qt-wayland via mamba did not fix the issue.