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Hitting CTRL+TAB to switch to prev document worked in previous versions. I'm running DEV 201209260001 and it looks like the editor eats CTRL+TAB. If you hit CTRL+SHIFT+TAB, notice that the Source button on top of the editor gets focus. When that happens you can hit CTRL+TAB and it'll work like normal. But as long as current focus is the code editor, CTRL+TAB will not work.
thanks for the report. Already fixed. *** This bug has been marked as a duplicate of bug 218987 ***