[Bug 54923] Drag and drop is not working in Delphi based applications

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=54923

--- Comment #4 from Lorenzo Ferrillo  ---
Created attachment 78554
  --> http://bugs.winehq.org/attachment.cgi?id=78554
Create dummy IDropSource when not provided to ShDoDragDrop

According to documentation SHDoDragDrop create a IDropDataSource when not
provided, and the ole32 DoDragDrop require it to be not null to work. 
This allow xEdit drag and drop to work (even if without the cell draws during
dragging)