quodlibet fails to build with Python 3.14.0a5.

ERROR: failed tests/test_library_file.py::TWatchedFileLibrary::test_watched_adding:
	D: [0061.472] SongFileLibrary.__init__: Initializing <class 'quodlibet.library.song.SongFileLibrary'>: None
	D: [0061.472] SongFileLibrary.__init__: Initialised <song.SongFileLibrary object at 0x7fb0253504c0 (quodlibet+library+song+SongFileLibrary at 0x55c21cabf110)>
	W: [0061.557] PluggableOrders.__init__: No plugin manager found
	W: [0061.558] PluggableOrders.__init__: No plugin manager found
	D: [0061.560] qltk.playorder.__compose_order: Updating PlaylistModel order to <In Order>
	D: [0061.563] NullPlayer.go_to: Going to None
	D: [0061.563] PlaylistMux.go_to: Told to go to None
	D: [0061.563] PlaylistModel.go_to: Told to go to None
	D: [0061.651] Query.__init__: Creating query ''
	D: [0061.651] Query.__init__: Creating query ''
	D: [0061.655] qltk.window.__restore_state: Restore state
	D: [0061.655] qltk.window.__restore_position: Restore position
	D: [0061.655] qltk.window.__restore_size: Restore size
	D: [0061.655] SongFileLibrary.__init__: Initializing <class 'quodlibet.library.song.SongFileLibrary'>: None
	D: [0061.655] SongFileLibrary.__init__: Initialised <song.SongFileLibrary object at 0x7fb02513fcc0 (quodlibet+library+song+SongFileLibrary at 0x55c21ca0f750)>
	D: [0061.655] SongFileLibrary.start_watching: Setting up file watches on ['/tmp/QL-TEST-aha9o6jg']...
	D: [0061.657] Query.__init__: Creating query ''
	D: [0061.658] PlaylistModel.set: Filling view model with 0 songs.
	D: [0061.658] SongFileLibrary.rebuild: Rebuilding, force is False
	D: [0061.658] SongFileLibrary.rebuild: Removing 0, changing 0).
	D: [0061.658] SongFileLibrary.monitor_dir: Monitoring /tmp/QL-TEST-aha9o6jg
	D: [0061.659] SongFileLibrary.monitor_dir: Monitoring /tmp/QL-TEST-aha9o6jg/HOME-kkrivej2
	D: [0061.659] SongFileLibrary.monitor_dir: Monitoring /tmp/QL-TEST-aha9o6jg/tmpxxm62afy
	D: [0061.659] SongFileLibrary.monitor_dir: Monitoring /tmp/QL-TEST-aha9o6jg/tmpnprv6ri3
	D: [0061.659] SongFileLibrary.monitor_dir: Monitoring /tmp/QL-TEST-aha9o6jg/tmp9bw_sw_0
	D: [0061.659] SongFileLibrary.monitor_dir: Monitoring /tmp/QL-TEST-aha9o6jg/tmpx_fnaamp
	D: [0061.659] SongFileLibrary.monitor_dir: Monitoring /tmp/QL-TEST-aha9o6jg/tmpqyxfqy__
	D: [0061.659] SongFileLibrary.monitor_dir: Monitoring /tmp/QL-TEST-aha9o6jg/tmpfzp0i58f
	D: [0061.660] SongFileLibrary.monitor_dir: Monitoring /tmp/QL-TEST-aha9o6jg/HOME-kkrivej2/.config
	D: [0061.661] SongFileLibrary.monitor_dir: Monitoring /tmp/QL-TEST-aha9o6jg/HOME-kkrivej2/.config/quodlibet
	D: [0061.661] SongFileLibrary.monitor_dir: Monitoring /tmp/QL-TEST-aha9o6jg/HOME-kkrivej2/.config/quodlibet/lists
	D: [0061.661] SongFileLibrary.monitor_dir: Monitoring /tmp/QL-TEST-aha9o6jg/HOME-kkrivej2/.config/quodlibet/export
	D: [0061.661] SongFileLibrary.monitor_dir: Monitoring /tmp/QL-TEST-aha9o6jg/HOME-kkrivej2/.config/quodlibet/playlists
	D: [0061.661] SongFileLibrary.stop_watching: Removing watches on 0 dirs
	D: [0061.705] PlayQueue._write: Saving play queue after 0.2s
	D: [0061.706] qltk.queue.__destroy: Stopped autosave
	D: [0061.721] SongFileLibrary.stop_watching: Removing watches on 13 dirs


=================================== FAILURES ===================================
___________________ TWatchedFileLibrary.test_watched_adding ____________________
tests/test_library_file.py:213: in test_watched_adding
    assert self.library, f"Nothing in library despite watches on {watch_dirs}"
E   AssertionError: Nothing in library despite watches on dict_keys([PosixPath('/tmp/QL-TEST-aha9o6jg'), PosixPath('/tmp/QL-TEST-aha9o6jg/HOME-kkrivej2'), PosixPath('/tmp/QL-TEST-aha9o6jg/tmpxxm62afy'), PosixPath('/tmp/QL-TEST-aha9o6jg/tmpnprv6ri3'), PosixPath('/tmp/QL-TEST-aha9o6jg/tmp9bw_sw_0'), PosixPath('/tmp/QL-TEST-aha9o6jg/tmpx_fnaamp'), PosixPath('/tmp/QL-TEST-aha9o6jg/tmpqyxfqy__'), PosixPath('/tmp/QL-TEST-aha9o6jg/tmpfzp0i58f'), PosixPath('/tmp/QL-TEST-aha9o6jg/HOME-kkrivej2/.config'), PosixPath('/tmp/QL-TEST-aha9o6jg/HOME-kkrivej2/.config/quodlibet'), PosixPath('/tmp/QL-TEST-aha9o6jg/HOME-kkrivej2/.config/quodlibet/lists'), PosixPath('/tmp/QL-TEST-aha9o6jg/HOME-kkrivej2/.config/quodlibet/export'), PosixPath('/tmp/QL-TEST-aha9o6jg/HOME-kkrivej2/.config/quodlibet/playlists')])
E   assert <song.SongFileLibrary object at 0x7fb02513fcc0 (quodlibet+library+song+SongFileLibrary at 0x55c21ca0f750)>
E    +  where <song.SongFileLibrary object at 0x7fb02513fcc0 (quodlibet+library+song+SongFileLibrary at 0x55c21ca0f750)> = <tests.test_library_file.TWatchedFileLibrary testMethod=test_watched_adding>.library

https://docs.python.org/3.14/whatsnew/3.14.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.14/fedora-rawhide-x86_64/08739194-quodlibet/

For all our attempts to build quodlibet with Python 3.14, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/package/quodlibet/

Testing and mass rebuild of packages is happening in copr.
You can follow these instructions to test locally in mock if your package builds with Python 3.14:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/

Let us know here if you have any questions.

Python 3.14 is planned to be included in Fedora 43.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.14.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires),
so if this package is required a lot, it's important for us to get it fixed soon.

We'd appreciate help from the people who know this package best,
but if you don't want to work on this now, let us know so we can try to work around it on our side.