Linux: condense mime-type definitions

[creativecoder]

Resolves: #15922

Condenses Linux mime-type definitions

• Removes duplicate application/x-musescore+xml declaration, moving both globs under a single mime-type
• Removes duplicate application/x-musescore for backup files, putting both *.mscz and *.mscz~ globs under one mime-type
• Fixes file extension typo, correcting mscsx to mscs

NOTE: this removes the "MuseScore compressed backup score" label from Linux file managers for .mscz~ files and replaces it with the regular "MuseScore File".

Because backup files are the same format as standard score files, I don't think they should have a separate mime-type. If the behavior of opening them needs to be different, I think that should be handled at the application layer.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The compressed MuseScore MIME type now matches *.mscz~ backup files. The uncompressed MuseScore MIME type now matches *.mscs files. Duplicate *.mscsx and compressed-backup declarations were removed.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes combine duplicate MIME declarations and correct the extension typo, addressing issue #15922 by improving Linux score-file identification.
Out of Scope Changes check	✅ Passed	All changes are limited to the Linux MuseScore MIME definitions and directly support the linked issue.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title clearly and concisely describes the main change to condense Linux MIME-type definitions.
Description check	✅ Passed	The description identifies the issue, explains the changes and impact, and completes the required checklist except for the optional test item.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

Warning

Review ran into problems

🔥 Problems

Linked repositories: Public OSS repositories can only analyze public repositories installed in this organization. No linked repositories were analyzed; skipped musescore/muse_framework.git.

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[Lazerbeak12345]

I just wanted to add, there is some prior work in Arch Linux. The distro packages a downstream fix not unlike yours. I don't expect this to change anything about this PR, however.

[mathesoncalum]

I signed the CLA as username

Hi - please insert your musescore.org username here. Thanks.

[creativecoder]

Hi - please insert your musescore.org username here. Thanks.

@mathesoncalum , sorry about that--fixed now.

[cbjeukendrup]

Given how different mscs files are from mscx files, I would say they deserve their own new MIME type (it's unlike those backup files, which have identical file structure). I must say I don't immediately have inspiration for a good name for such MIME type though...