[Bug 57338] New: wine-gecko/wine-mono don't cache their installers if using a username with unicode characters

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=57338

Bug ID: 57338
           Summary: wine-gecko/wine-mono don't cache their installers if
                    using a username with unicode characters
           Product: Wine
           Version: 9.19
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Keywords: download, source
          Severity: normal
          Priority: P2
         Component: programs
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: Debian

Noticed while looking at https://github.com/Winetricks/winetricks/pull/2278

I created a test user (`tëstuser`). If I then run Wine under that user, I get a
popup to install wine-mono. The installer downloads and installs wine-mono,
great.

Making a second prefix shows the installer prompt again. The installer doesn't
get cached in ~/.cache/wine (as it does for my normal, ascii-named user).

If the installer is put in /usr/local/share/wine/mono, it gets picked up from
there, as expected.

Which makes me wonder, are unicode characters supported in usernames for wine?
I suspect there may be other lurking issues like this, if so.

FWIW, Windows appears to support it (though various software is broken when
doing so), see https://cornevandriel.com/articles/unicode-in-windows-usernames