fix processor DnD from sidebar.
(default move action removes an entry in the TreeView)
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@ -78,7 +78,7 @@ public:
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_internal_vbox.show ();
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drag_dest_set (_targets, Gtk::DEST_DEFAULT_ALL, Gdk::DragAction (Gdk::ACTION_COPY | Gdk::ACTION_MOVE | Gdk::ACTION_LINK));
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drag_dest_set (_targets);
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signal_drag_data_received().connect (mem_fun (*this, &DnDVBox::drag_data_received));
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}
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