Automatic updates on Linux
MuseScore provides an AppImage as the official download format on Linux. The current AppImage is type 1. If this was upgraded to a type 2 AppImage then it could benefit from many of the new AppImage features, including automatic updates (e.g. via AppImageLauncher).
Creating the original AppImage was a herculean effort, but thankfully tools now exist to do the job automaticially. This means all the custom shell scripts in build/Linux+BSD/portable can be removed and replaced with a single command to run
linuxdeploy on MuseScore's compiled binary, making use of linuxdeploy's official plugins for AppImages and Qt.