Readd file associations

[tobiasdiez]

Fixes #5520. At least works on Windows. @LyzardKing could you please test this for linux as well? Thanks!

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• Change in CHANGELOG.md described
• Tests created for changes
• Manually tested changed features in running JabRef
• Screenshots added in PR description (for bigger UI changes)
• Checked documentation: Is the information available and up to date? If not: Issue created at https://github.com/JabRef/user-documentation/issues.

[LyzardKing]

I'll test it and see if the mimetype line can be removed from the .desktop template

[LyzardKing]

@tobiasdiez It works, in adding the association.
The problem is that jpackage isn't using the altered .desktop template in the buildres folder,
and that (I think) is also the reason for the issue with the browser addon opening new instances...
We'ew not adding the following:

GenericName=BibTeX Editor
Keywords=bibtex;biblatex;latex;bibliography
StartupWMClass=org-jabref-JabRefMain

[LyzardKing]

I think I found out how to fix the issue.
If you want to add the change to this PR the diff is minimal:

• rename buildres/linux/jabref-JabRef.desktop to buildres/linux/JabRef.desktop
• in that file replace the MimeType line with DESKTOP_MIMES

[LyzardKing]

There's only a small change to the linux desktop file.
It does seem to work, although in Ubuntu Mate I don't see the icon on the .bib files, but the association works..

[koppor]

@LyzardKing I hope, I understood your comment correctly: 1f607e5

[tobiasdiez]

Maybe the icon name in the association file is wrong. Do you have a png file next to the executable in the installed directory?

[LyzardKing]

@koppor Yes, that's the same thing I tested..
I'll have a look at the deb on master.
Actually no..there's an error..

[LyzardKing]

@tobiasdiez in jabref/lib there's the icon, and it's JabRef.png
But it doesn't seem to work with that either..