kivy/kivy — pull request #1473 by eulerreich (2013-08-31 21:54:32+00:00)
Title: System keyboard memory leak

When releasing system keyboard, its target was not reset to None, causing
memory leak.

(Not sure why github is putting changes merged from kivy/master in the diffs too, but my one liner change is in kivy/core/window/__init__.py)