A proposed modification to better support landscape orientation slide over in iOS9

[jimsugg7]

On an iPad, in landscape orientation, the left side bar is permanent and cannot be hidden. The chart shows on the right always.

With the introduction of slideover in iOS 9, this creates an unfortunate problem. It would be great in portrait view to use a slide over window for a lyric sheet, notes, lists, whatever. But the slide over obscures the chord chart.

Implementation possibilities:
1. Monitor the application window width property which will shrink when a slide-over happens. Hide the left side navigator when width is reduced, and center the chord chart in the remaining width. (This is probably the best approach.)
2. Simpler: allow an option for the user to hide the left side navigation pane in landscape view.

Here is a screen shot:



As always, thanks for a great program.