Window keeps disappearing after failing to discard a hunk

[sminnee]

This is a bit of a weird one.

Test case:

• Attempt to discard a hunk of a changed file, that fails because git says "patch does not apply".
• GitX window is hidden, and just the error dialog box is shown.
• Press OK in the dialog
• Click on GitX in the dock, the GitX window appears
• Click anywhere on the GitX window, it disappears.

The only way to get out of this state is to re-start GitX.

[brotherbard]

This is fixed in 10a0cb5