What is the Vision launch icon setting supposed to do?

My previous question, Is there a known problem with Ignition 8.0 Launcher icons?, has been answered with a rather complex and manual procedure for adding icons to a window. They now show up on the titlebar, taskbar and application switcher.

I’ve played around with the Vision | Project Properties | Launching | Launch icon setting trying icons of various sizes 16, 24, 32 and 48 pixels square.The icon doesn’t seem to show up on the launcher or on the desktop shortcut.

How is it supposed to work?