[mythtv] [PATCH] wrapping navigation for menus

[Joseph A. Caputo]

The attached patch implements a rudimentary 'wrapping' behavior for 
ThemedMenu.  It's kind of a hack; it doesn't handle PgUp/PgDown at all, and 
it doesn't do anything to adjust the screen position of the menu (i.e., if 
you 'wrap' back from the top of a single-column menu to the bottom, the whole 
display shifts so that the current item is now at the bottom).

It's not elegant, but at least it relieves some of the tedium associated with 
navigating menus with lots of items.

Oh, and for multi-column menus (blue theme, e.g.), column wrapping is also 
implemented.  Moving off the end of a column will also increment/decrement 
the current row.

-JAC

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