Linux? "Start and Debug external application" [apparently] clears environment variables with Desktop Kit

Steps to reproduce:

• Build some Qt example for X11/Desktop
• Debug it as external executable by "Debug/Start and Debug external application" with normal Desktop kit
• Note app does not start:

  DPY= ""
  Qt: gdb: -nograb added to command-line options.
  	 Use the -dograb option to enforce grabbing.
  QXcbConnection: Could not connect to display