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When switching between applications in the Xgl window system, netbeans (and of all my applications only netbeans) upon receiving the focus by the window manager doesn't really have the focus. The netbeans window is indeed highlighted, and the last used TopComponent is also highlighted, but using keyboard shortcuts has no effect. The same applies for the arrow keys, and other keys that should have some effect on whatever TopComponent is selected in NetBeans.
*** This issue has been marked as a duplicate of 84367 ***
verified