Some notes:

• The mime type configuration in Release 4.0 is ambiguous and not configured properly. On their discord they are discussing some way of patching an issue with the MIME type comments
• The name in the *.desktop-file is not set correctly. MSCORE_UNSTABLE is somehow not set to false during build: https://github.com/musescore/MuseScore/blob/master/build/cmake/SetupAppImagePackaging.cmake#L15

Maybe I should provide patches that are introducing better behaviour before they land in upstream?

The crashpad handler is build albeit the cmake setting is set to off. Probably further testing on unstable needed if the handler has to be build at current state of cmake files.

In D13905#238478, @maikwoehl wrote:

Maybe I should provide patches that are introducing better behaviour before they land in upstream?

If there are known issues with the current released version, and solutions to fix them exist already, then yes, I'd say we should integrate patches.

Alright, there are some fixes on main branch already that are fixing some build issues on Linux. I will get to it on next weekend.

In D13905#238659, @Staudey wrote:

In D13905#238478, @maikwoehl wrote:

Maybe I should provide patches that are introducing better behaviour before they land in upstream?

If there are known issues with the current released version, and solutions to fix them exist already, then yes, I'd say we should integrate patches.