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Ctrl-Tab is in some cases in conflict with Swing, which couses A11Y issues. For example, see issue 65678. Window system registers ctrl+tab for switching between editor tabs, but it is also swing shortcut for leaving editor pane. [200510061800, JDK 1.5.0_05, solaris 10/sparc]
It's intentional. I remember we were speaking about it long time ago and current state is a trade-off
OK, verified WONTFIX.