Hello Thomas,
 

As mentioned in the formal ticket, these 2 functionalities are pretty much inter-correlated and it it strange that you don't face in in the version from 2012. Frankly, there are many releases between these 2 versions and a lot has changed and implemented. Nevertheless, here is a workaround you can use to resolve the issue:

            function rowDropping(sender, args) {
                if (sender.get_masterTableView()!= args.get_targetItemTableView().get_id() &&
                    args.get_draggedItems()[0].get_element().id != args.get_targetItemId()) {

                    // Continue
                    alert("Continue with your logic");
                }
            }

Regards,
Eyup
Progress Telerik

Hi Thomas,

The Row Selection and Drag-n-Drop are inter-related. For example, there cannot be dragging of Rows if the AllowRowSelect property is set to false. 

When you start dragging a row, it gets automatically selected:
https://docs.telerik.com/devtools/aspnet-ajax/controls/grid/rows/drag-and-drop-of-grid-items#row-selection

Similarly, even a slight mousedown-mouseup action (the definition of a mouse click) over the item means a very quick drag-n-drop, because once the users initiates a mouse-down action, the row begins to drag until the next mouse-up action. There is no way for the grid to tell whether the initiated dragging will end in 1 millisecond (simple selection) or in 1 minute (full dragging).

I hope this makes sense.

Regards,
Eyup
Progress Telerik