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dev build from Jun17, Linux, JDK1.5.0b55 Open project, ALT-SHIFT-O, open some Java file and the UI can become frozen for a long time because fold updating asks for MDR data that may need to parse large amount of sources (superclasses, ...).
Created attachment 15808 [details] thread dump
already tracked *** This issue has been marked as a duplicate of 42333 ***