prevent nested menu from obscuring parent when user clicks towards right edge of window

[dwightkelly]

fix for issue #143

[josetaira]

hi @dwightkelly, thanks for your contrib. Not able to test this immediately, but before I merge it in, could you please post a screenshot of what it looks like with this change?

[dwightkelly]

normal "right" mode

overlapped if child menu would render off right edge of window

[AlexConnolly]

This doesn't work for menus that have more than 2 levels.

Note how the right of the image is the edge of the screen. Will look at fixing this now, but feel free to validate too.

[AlexConnolly]

I'm using orientation left right now to resolve my issue. I guess in this circumstance, for me, it was easier to use orientation left. I couldn't find any documentation for this, though, so it would be nice to maybe be pointed in the direction or I will happily write some.