I also update the icon to match what is on the "Hide Track" button.
Fixes#49: Hidden playlist still says "Banned" in sidebar
Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>
I'm using multiple treeviews, but only one should be selected at any
time. Use this function to coordinate that.
Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>