github/Rebel — pull request #139 by joshaber (2014-06-30 21:14:21+00:00)
Title: Don't care if our parent window is key.

This check is confusing. It lets us make the parent window key without dismissing the popover, which seems contrary to the docs for `RBLPopoverBehaviorSemiTransient`:

```
Closes the popover only if there is a mouse up within the popover's parent window or `esc` is pressed.
```