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NetBeans IDE Dev (Build 200604111800) 1.5.0_06; Java HotSpot(TM) Client VM 1.5.0_06-b05 Windows XP version 5.1 running on x86 en_US (nb); Cp1252 If user wants to save project properties dialog and some project files are not saved (project.xml, build.xml) exceptions are thrown and the operation is not finished. Excetions thrown are FileAlreadyLockedException for the first time and IllegalStateException if saving the prj props. afterwards. I think that there should be a check if any important project files affected by saving project properties are opened in editor and not saved then user will be asked to save changes. Not sure if each project type should do the check or it can be done in projectui in general, because each project might have different set of affected files.
Created attachment 29830 [details] exc stack traces
Long known. *** This issue has been marked as a duplicate of 50992 ***