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[ BUILD # : 201211020750 ] [ JDK VERSION : 1.7.9 ] When reviewing results in the "inspect and transform" view, switching between files shows a red filled window in the "before" screen part (left) for a fraction of a second. Background is back to white when the window shows the final content and scrolled to the correct position. This is a annoying but not a big deal.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss