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This issue is related to issue 47713 (I think that is the number). I frequently expand and close the tree view for the file system and at least two to three times a week this results in an inadvertant move of a file or an entire directory/package. This happens to several engineers that work for me so it is not isolated to my configuration. I have been using Netbeans for several years now and this started when the drag and drop capability was added. Please fix this so that I do not have to use an inferior IDE. This bug can result in significant loss of productivity.
Nothing to do with filesystems.
If DnD bothers you, disable it using -J-Dnetbeans.dnd.enabled=false You start unwanted DnD using doubleclick? *** This issue has been marked as a duplicate of 47713 ***
verified as duplicate