This doesn't look related to source of icon, but simply the inability of plank to match this application to a desktop-file. Make sure the WM_CLASS set by this app matches the StartupWMClass in its desktop-file.
This doesn't look related to source of icon, but simply the inability of plank to match this application to a desktop-file.
Make sure the WM_CLASS set by this app matches the StartupWMClass in its desktop-file.