If you want to test the .desktop file change, you need to:
* edit /usr/share/app-install/desktop/ooo-math.desktop, not any other copy (app-install-data has its own copies of .desktop files, generated automatically);
* run 'sudo update-app-install' before starting g-a-i
If you want to test the .desktop file change, you need to:
* edit /usr/share/ app-install/ desktop/ ooo-math. desktop, not any other copy (app-install-data has its own copies of .desktop files, generated automatically);
* run 'sudo update-app-install' before starting g-a-i