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061120, JDK 6. Working on ModuleManagerTest.java. Occurred at the same time as issue #89707 but not sure if they are related.
Created attachment 36151 [details] Stack trace
Is it reproducible?
Surely not.
This diff side bar is missing a document read lock leading to this inconsistency. Reassigning to versioncontrol. Please use Document.render() or AbstractDocument.readLock(); try { ... } finally { AD.readUnlock(); } around all accesses to document's text.
*** This issue has been marked as a duplicate of 100239 ***