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Hard to reproduce. But 1) A lot of opened files in editor 2) switch from IDE and delete some of those opened files 3) cvs up still outside of IDE 4) switch back to IDE (so they should be refreshed in IDE) 5) and immediately press Ctrl-Shift-F4 Not standard usecase :) but shouldn't thrown NPE (see. attach). Probably just check for the null at line with "doc.addUndoableEditListener(getUndoRedo());"
Created attachment 23226 [details] NPE
Fixed: openide/text/src/org/openide/text/CloneableEditorSupport.java,v1.6 Please try to verify.