Keep selected item centered on the screen when scrolling

So as to make movies further to the right or left easier to find when 
scrolling through the OML movie list in cover mode, if it was an option to 
have the selected item be centered horizontally on the screen so as to 
have upcoming and previous items on the menu visible on either side.

E.G. (SI is selected Item)

11  12  13  14  15
21  22  SI  24  25
31  32  33  34  35

12  13  14  15  16
22  23  SI  25  26 
32  33  34  35  36

13  14  SI  16  17
23  24  25  26  27
33  34  35  36  37

The exception would be at the very beginning or very end of the list.  
(Unless the Movies list wraps around)

Original issue reported on code.google.com by btall...@gmail.com on 18 Sep 2008 at 11:39

peeboo / open-media-library

Keep selected item centered on the screen when scrolling #83