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The IDE deadlocked on me today when opening file. (using Shirt-Alt-O dialog - not sure if relevant) using build from 20040719. thread dump attached. it seems like it's something with at org.netbeans.editor.ext.ToolTipSupport.setToolTipVisible() but maybe it's pure swing problem.
Created attachment 16356 [details] thread dump
JDK issue: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4852507 also see issue #37793