Custom Application Launcher with Application in Terminal enabled should use user-specified terminal emulator

[N0rbert]

Expected behaviour

Midnight Commander is opened in the user-defined terminal - in Tilix

Actual behaviour

Midnight Commander is opened in default terminal - in MATE Terminal

Steps to reproduce the behaviour

1. Install Ubuntu MATE 21.10

2. Install non-default terminal - Tilix, by sudo apt-get install tilix

3. Install terminal-based application - Midnight Commander, by sudo apt-get install mc

4. Set Tilix as default terminal in mate-default-applications-properties or programmatically:

   gsettings set org.mate.applications-terminal exec "'tilix'"
   

5. Set Tilix as alternative for x-terminal-emulator by update-alternatives:

   update-alternatives --set x-terminal-emulator /usr/bin/tilix.wrapper
   sudo update-alternatives --set x-terminal-emulator /usr/bin/tilix.wrapper
   

6. Reboot

7. Add Custom Application Launcher to the MATE Panel:

   • Type: Application in Terminal
   • Name: mc
   • Command: mc

8. Click the icon of just created Custom Application Launcher

MATE general version

1.26.0

Package version

1.26.0-0ubuntu1

Linux Distribution

Ubuntu MATE 21.10

Link to bugreport of your Distribution (requirement)

https://bugs.launchpad.net/ubuntu/+source/mate-panel/+bug/1873750

Notes:

• This also happens with desktop-files installed by Midnight Commander, it opens in MATE Terminal when called from Brisk menu, Classic menu, Compact Menu, Dock, <Alt>+<F1> menu, Advanced Mate Menu (mate-menu package)
• What is interesting, the <Alt>+<F2> respects user preferences and uses Tilix
• Also <Ctrl>+<Alt>+<T> opens Tilix as expected.

[N0rbert]

Still happens on latest Ubuntu MATE 22.04 LTS beta.

[cwendling]

See also https://gitlab.gnome.org/GNOME/glib/-/issues/338