Separate terminal emulator app and extension

[amezin]

There are currently two things in one package: a terminal emulator app, and an extension that moves its window/handles global hotkeys.

The app could be distributed as flatpak instead - this will allow using a better language/runtime (for the app, but not the extension) than javascript/gjs (python + pygobject, for example).

The extension already finds the window by its d-bus path - the app could tell the extension which window exactly it should use (through d-bus too). So the app could be a full featured terminal emulator, with only one of the windows acting as a drop-down terminal.

Not sure if flatpak "spawn on host" can be implemented in gjs, or if it requires a rewrite in python. If the latter is true, it makes sense to wait for VTE on Gtk 4 (it can be built already, but not included in GNOME's flatpak runtimes, as far as I can tell).

[amezin]

Given the number of workarounds and hacks required, shipping the app and the extension separately may not be possible - they should have compatible versions, and the compatibility breaks frequently.

Gtk 4 and other improvements will come with GNOME 45 version.