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The "scanning project classpaths" dialog is not cancelable. Even the X in the upper right corner doesn't work. There should be a way to cancel it so you don't have to wait a long time (for large projects) to open/refresh. This option should be available even if the ide is more intelligent about when it needs to rescan classpaths.
java/mdr issue, reassigning.
Modal scaning dialog was removed from NB 4.2