Ideal update scenario

QGIS example:

1. User is working in QGIS and noticing a green arrow in the corner (indicating that update is available)
2. User clicks on the arrow
3. User is asked to save his results if project is dirty or layers have edits
4. Window shows up with:
   • Info that version N can be updated to version M
   • Link to changelog
   • Warning that QGIS will be closed and reopened
   • 'Proceed' button
5. User clicks Proceed and QGIS closes, progressbar appears and show downloading and installation status.
6. On completion, QGIS is reopened with the project that was opened before.