The newest snapshots introduced native fullscreen on Mac OS X. And I can't thank you enough for that. It eliminates my other issue: MC-28255
But this introduced a minor bug to me. When going in fullscreen with the "two-arrows-button" in the upper right corner, the top of the window is grey. It looks like it is some sort of a bug with the menu-bar in OS X. I don't know if it's a LWJGL, OS X or Minecraft bug though. See attached picture.
Again, thanks for the native OS X fullscreen. So much better, especially with dual screens. 🙂
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Duplicate of MC-40597 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
Oh, sorry, I didn't see that one.. Probably because I was only looking in the "e" snapshot.
But the procedure to reproduce the bug isn't quite the same though. You only need to press the fullscreen icon in the title bar, and then I get the black bar. MC-40597 is a bit longer, and a little different, but i guess you could call it a duplicate. 🙂

I'll look into editing it.
Added crash-report.