GLib Debian packaging
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Choosing a terminal emulator for Terminal=true applications
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When a GLib-based application launches a .desktop file with Terminal=true,
such as /usr/share/applications/mutt.desktop, GLib must choose a terminal
emulator that will be used to display the command-line application. This
version of GLib aims to provide reasonable defaults for users of common
desktop environments, while allowing advanced users to override those
defaults on a system-wide or per-user basis.

If the xdg-terminal-exec package is installed, this version of GLib will
use it by default. xdg-terminal-exec has not been standardized and is not
intended to be included in Debian 12, but will hopefully be included in
Debian 13.

Otherwise, this version of GLib will prefer to use a GTK-based terminal
emulator, even if the x-terminal-emulator alternative points to something
different. This is intentional, to avoid having GTK applications in a
GTK-based desktop environment launch some other desktop environment's
preferred terminal emulator on machines that are shared with a user of
a different desktop environment.

To override GLib's choice of terminal emulator, users can add a directory
such as $HOME/bin to their PATH environment variable, and place a script
named "xdg-terminal-exec" in that directory, with contents similar to:

#!/bin/sh
exec x-terminal-emulator -e "$@"

replacing "x-terminal-emulator -e" with their preferred terminal and
whatever arguments it requires before the command to be executed.

This configuration can be applied system-wide, if desired, by placing
a similar script in /usr/local/bin.