Mark Tooltips as Special Windows

To prevent the window previews in the panel from being maximized when using the "Maximizing" window policy

BUG: 514820

Note: There would be other ways of doing this as well, but considering tooltips as special windows feels right. I looked at other places where isSpecialWindow is used and couldn't find anything that would obviously break with this. Still, I could be missing something entirely. Please yell at me if this is terrible :)

This is the screen without this patch and Maximizing policy:

bug.png

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