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Sometimes when I just switched the java sources in editor, the IDE has frozen for some time. Provided thread dump, shows the problem is in updating of the editor toolbar, which blocks AWT thread.
Created attachment 7105 [details] Full thread dump during the freeze
The culprit here seems to be the Beans Patterns module - it does all the analysis quite eagerly and synchronously (even within addNotify).
I cannot really test it (since the reproduction is not bulletproof), but I forked bean patterns processing a RequestProcessor except cases where the results are expected synchronously. /cvs/beans/src/org/netbeans/modules/beans/PatternChildren.java,v <-- PatternChildren.java new revision: 1.22; previous revision: 1.21
Editor combo works fine now [200210090100]