Store/restore parent view position when backing out of sub views.

[RayMYP]

Simple enhancement that makes the library views to remember and jump to their last position when coming back out of sub views. So if you have a large library list and select 'Moby' then an Album, add a couple of songs to the playlist and back out it will set 'Moby' top of the list rather than jumping back to position 0 and making you scroll through it all again.

Simple counter on the adapter that is get/set so it handles 'N' views i.e. works for Genre/Artist/Album where Artist could have several hundred entries for a Genre it will still jump back to the last Artist selected as you come back out of Album.

list.position.store-restore.patch.txt

[amuttsch]

Can you create a pull request for this?