Add tooltips for media info
Add tooltips for artist, album & song title to widgets that commonly support it. This allows ellipsized labels to be read.
The following widgets have tooltips added or altered:
- SongWidget
- SidebarRow
- AlbumCover
- Song info in PlayerToolbar
- AlbumWidget
Devel notes
- I did not add tooltips for the TreeViews since it is not offered by default by gtk.