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I had an empty IDE and opened project "image" (the standard NetBeans module). The IDE started to scan the project's classpath... and suddenly it stopped in the middle of the process (see the attached screenshot). Apparently, the AWT event queue thrad runs, as the IDE still gets repainted if it is (partly or fully) obscured and then uncovered. I will attach the full thread dump.
I accidentally filed this bug report twice - this is an exact duplicate of bug report #48320. *** This issue has been marked as a duplicate of 48320 ***