The source project of this merge request has been removed.
- all .ui files: bump required GTK version to v. 3.20
- primary-menu.ui: deleted because the file was no longer used
- window.ui: updated popover menu to prevent unnecessary clicks (the code was
This commit doesn't interfere in the transition to GTK 4. It's HIG oriented.
Before: 
After: 
(it's similar what we see in Nautilus)