I have written two Perl/Gtk programs. When launched from the dash menu, they run just fine.
However, if I try to launch them from terminal using the very same command found in their .desktop files, their Unity launcher will be blurry and will remain inactive when clicked, if I keep it in the Unity bar.
The problem is solved if the Exec part of the desktop file is replaced with
perl path_to_script
However, that leads to other problems, including a lintian warning and forcing all Perl GUI applications running from terminal to adopt the same launcher.
This issue is quite annoying since one of the programs relies on a different (Python) program in order to be launched and this results in having a blurry and inactive launcher.
I found out what was wrong. I had to enter the correct StartupWMClass at the .desktop file.
For those who are struggling with it, launch the application from terminal and execute in a different terminal the command
xprop | grep WM_CLASS
Click on your application and the output of the previous command will be
WM_CLASS(STRING) = "result"
Add to the .desktop file the following line:
StartupWMClass=result
Substitute result with your output.
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