Modified the manipulation of the popup for playlists. Now it's only updated when there's a modification on the playlists (a new playlist is added, a playlist is deleted or a playlist is modified). This seems to fix the popoup issue on the sidebars, so I proceed to remove the workaround code
Bugfix: if the current genre or playlist got deleted and the popup selection reseted, the current selection wouldn't be marked with the radio check.