Cursor doesn't refresh in Commit Message input area

[gonzoyumo]

Hi there, I just switched to gitx-dev and found this small but quite annoying bug.

When typing into the Commit Message input area, the cursor is moving correctly. But when you start moving using arrow keys, prev/next word, start/end of line or even the mouse, the cursor just stay where it is until you start typing.

And by the way, it doesn't blink :)

I'm using GitX 0.15.1964 dev and macOS Sierra 10.12.3

Thanks.