Dual screen config error (and no docs for JSON config files)

[ricardo-reis-1970]

I'm using Tilix 1.9.6on Ubuntu 24.10. I started wondering for docs on configs because I have different setups per project and up to now all I could do was to save sessions and guess.

While tinkering around, I found out something of a bug that I will simply leave here, for I think that the total and complete absence of config docs is more important.

The bug (dual screen)

I have a dual monitor setup. If I open a tilix terminal and resize it for the total area of both screens, and then save,here's the JSON I get:

{
    "child": {
        "directory": "\/path\/to\/folder",
        "height": 994,
        "profile": "a769bc48-e660-47ca-916d-c6f433a5715a",
        "readOnly": false,
        "synchronizedInput": true,
        "title": "TITLE",
        "type": "Terminal",
        "uuid": "efd464ce-3289-4850-889d-36ad979d1aa1",
        "width": 3774
    },
    "height": 994,
    "name": "${title}",
    "synchronizedInput": false,
    "type": "Session",
    "uuid": "ee3e992e-8f52-4deb-b57a-9e4a98e01c39",
    "version": "1.0",
    "width": 3774
}

This is all good, especially when compared with the single screen, which has width of 1854 (main screen,excluded space for Gnome dock) or 1920 (secondary screen). Please note that the full 2 screens width is precisely 1854+1920. All perfect.

The issue is that when opening Tilix with this config, it will not span across monitors. It will go onto the secondary screen, maximised, and that's all.

Either there is a bug when saving the config and some parameter is missing, or there is a bug when loading the config. On both cases, the absence of docs is not helpful.