Fix warning on GLib >=2.79.2

[C-512L]

No description provided.

[amezin]

Your change isn't compatible with GNOME versions older than 46. ddterm master branch currently supports GNOME >= 43. Between supporting more GNOME versions, and getting rid of a warning, I will obviously choose compatibility.

But you likely can make it work for all GNOME versions using https://gjs-docs.gnome.org/gjs/overrides.md#gi-require

[C-512L]

I have been able to backport it to all systems using ESM on my own branch, but I might have stumbled on a ESM translator edge case being unable to translate import Gi from 'gi'; correctly. I tried to look at that code of translate-esm.js but unfortunalety I haven't found much documentation about using gi.require() on pre-ESM GJS to make a patch by myself.

[amezin]

There's also sed preprocessing step to solve issues like that:

gnome-shell-extension-ddterm/ddterm/shell/notifications.js

Lines 143 to 151 in bfcdf69

	// BEGIN ESM
	if (this.source.addNotification)
	this.source.addNotification(this);
	else
	this.source.showNotification(this);
	// END ESM
	// BEGIN !ESM
	this.source.showNotification(this);
	// END !ESM

(although here it's used just to remove unnecessary if from legacy version)

You should be able to use legacy imports between // BEGIN !ESM and // END !ESM lines

[C-512L]

I didn't feel sure about adding a lint exception, but I guessed it would be a better solution than adding dead code to the non-ESM build or duplicating the preprocessed code. Feedback is welcomed.