MacOSX backend blocks in IPython QtConsole

[minrk]

When plotting with the OS X backend (%pylab osx), the IPython qtconsole¹ will hang while a plot window exists. This is indicative of a failure to actually enter interactive mode.

A trip through git bisect suggests that the bug was introduced in 2f11dee, ostensibly purely style changes. I didn't see anything obvious, but I cannot reproduce the issue with 76bba3d, and I can 100% of the time with 2f11dee and current master (17e1cf8).

The OS X backend works fine in terminal IPython (where inputhook events still fire), and the Qt backend works fine in the qtconsole.

This is OS X 10.8.2, with System Python 2.7.2, IPython master, etc.

¹ qtconsole is not actually relevant, any IPython kernel-based app, such as ipython console or the notebook is affected.

[minrk]

Ah, I think I found it (by diffing an AST dump to scrub all of the meaningless style changes). Pull Request on its way...

[minrk]

Should be fixed by PR #1493.