Selecting multiple files while holding Ctrl or Shift not possible in icon view
while single click is in use. 

Selecting multiple files by "painting" them with mouse works, but it cannot be
used for selecting othet than files next to each other. This Ctrl/Shift
selection works in detailed list view

Reproducible: Always
Steps to Reproduce:
1. Enable Single click from Edit-Preferences-behaviour
2. Enable icon view from View-View as Icons
3. Try to select multiple files by clicking them while holding Ctrl or Shift pressed

Actual Results:  
When clicking a file while holding Ctrl or Shift pressed, file is opened (e.g.
clicking a video clip opens it in Xfmedia)

Expected Results:  
When clicking a file while holding Ctrl or Shift pressed, file should not be
launched. It should just be selected like it does in double-click mode.