Prevent double icons in Linux launcher #2523

Is your feature request related to a problem? Please describe.
When running Linux HeidiSQL, I got two icons in my launcher and ALT-Tab.

Describe the solution you'd like
Only show one icon by default, provide this in the created desktop file.

Describe alternatives you've considered
Workaround:

• edit /usr/share/applications/heidisql.desktop
• add StartupWMClass=heidisql

Additional context