Clicking a file A, holding down shift key, and then clicking on another
file B with the mouse button will properly select a group of files from A
though B. The shift key modifer fails though when using the up and down
arrow keys on the keyboard to select files.  If I select file A, and then
while holding down the shift key use the down arrow to get to file B, the
file grouping does not work as expected and actually no file group
selection happens.