MacOS – Keyboard shortcut for “Revert Changes” in closing dialog

I think this is a bug in Mac OS X and has something to do with the way the keyboard shortcuts for Spaces are processed. Try this:

• Make sure Spaces is turned on in the System Preferences with the standard 4 spaces layout, and standard key combination for switching to a space.
• Open a folder in the Finder.
• Press and hold CTRL, and press any of the number keys. If you press 5, 6, 7, 8, 9 or 0 first you will get a beep. Same if you press one of those keys again (still holding CTRL). If you then press 1, 2, 3 or 4, you will switch to that space number; or just stay in that space if you were already in it. If you then press any of 5, 6, 7, 8, 9 or 0 again, it won't beep anymore.

If you simply turn off Spaces, the above won't happen and whatever order you press the keys in, they will continue to beep. If you change the number of spaces to only two, then 3, 4, 5, 6, 7, 8, 9 and 0 will give you a beep until you've pressed either 1 or 2. I don't know of an application in which those keys have a non-Spaces functionality and would do something useful other than beep, so I haven't been able to try what happens in such an application. In any case, I don't think you need to worry there's something wrong with your keyboard or the way you've configured the keyboard bindings; it seems to be a bug in Mac OS X.

Edit: Try the above in a new folder in which you've created folders named "1", "2" and so on. I find the Finder's behavior in this case somewhat strange: if you press CTRL-8, it will beep yet also switch the selection to the folder named "8". But again, pressing 5 through 9 will neither beep, nor change the selected folder once you've pressed any of 1 through 4.

The Spotlight search box is the one in the top-right of the menu bar (commandspace). The Find search box is the one I think you're talking about, within a Finder window.

To get focus back to the search field, hit controltab or commandf.

Another option is found in System Prefs > Keyboard > Shortcuts. There's a radio button near the bottom labeled "Full Keyboard Access". "All Controls" will let you tab through the other search fields without modifier keys.

That said, in my testing, there're some flaws. Some of the fields aren't selectable, and if you try to select one of those and then hit commandf, you can no longer tab through the other fields anymore—you have to open a new Finder window and start over.