matplotlib/matplotlib — pull request #2262 by mrterry (2013-07-31 16:41:36+00:00)
Title: View accepts FirstResponder (for key_press_events)

In the macos backend, [View keyDown:] (connects Cocoa event loop to mpl
key_press_events) was not being called because View did not accept being
first responder.

This was discussed in #2120, but could use some more attention.