Filter environment variables like GNOME Terminal

[amezin]

ddterm should filter environment variables like GNOME Terminal does: https://gitlab.gnome.org/GNOME/gnome-terminal/-/blob/006fbb8a2d986eb59ed2bb4d1ed29110d5032fb4/src/terminal-client-utils.cc#L341

Currently, every spawned process (shell) inherits all variables from ddterm process.

VTE has a flag for it: https://gjs-docs.gnome.org/vte291~2.91/vte.spawn_no_parent_envv

However, it can't be passed from GJS, because:

JS ERROR: Error: 0x2000040 is not a valid value for flags argument spawn_flags

As a workaround, some variables could be filtered out by unsetting them in ddterm's process environment. For the remaining ones, overriding them with an empty value could work.

[amezin]

https://gitlab.gnome.org/GNOME/vte/-/issues/2723

[amezin]

Console doesn't seem to filter environment variables. However, when started through .desktop file, it doesn't have things like GJS_DEBUG_TOPICS