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JavaFXSource#runUserActionTask should not be called from EDT. Cf. attachment or just run NetBeans (fresh trunk) and java.editor implementation, which does: ProgressUtils.runOffEventDispatchThread(new Runnable() { public void run() { performGoToImpl(doc, offset, goToSource, tooltip, javadoc, cancel); } ...
goto support - Petr
*** This bug has been marked as a duplicate of bug 179381 ***
verified as duplicate