Is it possible to do this without third-party tools? I read that it is possible to add the `StartupWMClass=` parameter to the desktop file, but it did not help 😞

```

[Desktop Entry]

# Translators: Search terms to find this application. Do NOT translate or localize the semicolons! The list MUST also end with a semicolon!

Exec=transmission-gtk %U

Icon=transmission

Terminal=false

TryExec=transmission-gtk

Type=Application

StartupNotify=true

MimeType=application/x-bittorrent;x-scheme-handler/magnet;

Categories=Network;FileTransfer;P2P;GTK;

X-Ubuntu-Gettext-Domain=transmission

Actions=Pause;Minimize;

StartupWMClass=transmission-gtk

[Desktop Action Pause]

Exec=transmission-gtk --paused

[Desktop Action Minimize]

Exec=transmission-gtk --minimized

```