timusus
Migrate the Songs tab from Library to Compose.
While implementing the song selection stuff I've detected some issues and inconsistencies with other Android applications. As they're not related to the migration (the already existed), I'll rather fix them in a separate pull request when this one is closed.
Unrelated to this tab, also fix genre context menu having no playlists on "Add to playlist" submenu. This happened only from time to time, after switching to other tabs or pages. The menu would appear only with the "New playlist" entry. It would fix itself after switching to other tabs (not always).
The issue was the playlist list passed to the genre list composable wasn't using a reactive type, so it wouldn't trigger a recomposition if it changed. I guess there's some race condition that make it work most of the time.
