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When opening an existing grails project in the IDE the target directory is incorrectly treated as a source directory. To reproduce - externally create a new grails project, also externally initialise it (eg run-app), so target dir is created, then open in NetBeans - target dir is shown as Target source dir.
Target folder was hidden while solving issue https://netbeans.org/bugzilla/show_bug.cgi?id=254464