Comment OS X mouse quirkiness in Finder (Score 2, Informative) 546
The deselection you describe is the fault of a spectacularly stupid decision on the part of the Finder's designers.
In List View, if your drag-click starts on the icon or text label of a file, it is interpreted as a drag-and-drop operation; if you start the drag on a blank area in the window, EVEN IF IT IS PART OF THE SELECTION, the Finder interprets it as the start of a new selection.
I can't figure out why they thought this was a good idea, but this is why some drag-and-drops turn into deselections; you have to start dragging a file's icon or name.
In List View, if your drag-click starts on the icon or text label of a file, it is interpreted as a drag-and-drop operation; if you start the drag on a blank area in the window, EVEN IF IT IS PART OF THE SELECTION, the Finder interprets it as the start of a new selection.
I can't figure out why they thought this was a good idea, but this is why some drag-and-drops turn into deselections; you have to start dragging a file's icon or name.
