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In NetBeans, and ill-judged movemovent of the mouse can be lethal to a project. It is much too easy to accidentally drag one directory to another, and once it is done it can only be undone manually. Furthermore, there is no way of knowing what was copied and to where. A solution to this would be to show a confirmation dialog before starting to move files. I realise that Windows Explorer does not do this. However, i) There are other ways in which the filesystems explorer differs from the Windows Explorer (for example, in the different interpretation of what copying one directory over another means) ii) It is harder to this in Windows explorer, because for thing WE is not there in front of you all the time, and for another, it is not as given to freezing up and then unfreezing, as NB is (when WE freezes, it usually stays frozen)
*** Issue 51567 has been marked as a duplicate of this issue. ***
It may be better to improve the drag-start gesture to better recognize intended drag from accidental one. E.g. don't start dragging unless the button is held for some time, don't start DnD on doubleclick, ...
However, this issue is particulary solved by Refactoring dialog. In projects view, when moving package, java, .. but Drag start gesture should be better, i agree.
D'n'D -> Standa.
i believe this is rather an enhancement than a bug. i agree with pnejedly that it would be better to improve drag gesture recognizer instead of using confirmation messages.
We can make the d'n'd gesture harder to make accidentally. But otherwise I think this is a won'tfix case.