#1568 Dragging files to opened folders should put the files in those folders

[Elena]

If I drag a file from Windows explorer to the management window onto a folder label, it is added to the project inside that folder, as it should be. But if the folder is opened (unfolded) and I drag a file in the list of the folder content, it gets inserted in the project but under a different folder (same as when I add files to project via menu). Please allow dragging files to the list of an opened folder, thx

[Miguel Gimenez]

For future reference:

ProjectTreeDropTarget::OnData()