kivy/kivy — pull request #824 by gebart (2012-11-27 11:41:12+00:00)
Title: Implement all orientations in StackLayout

This allows StackLayout to organise widgets in any combination of lr,
rl, tb, bt orientations. Widgets are aligned depending on the
orientation as well. Left to right left-aligns widgets, right to left
right-aligns widgets, top to bottom aligns widgets to the top, bottom to
top aligns widgets to the bottom.