Quickly install custom theme with latest AT|AT Tool in D 10.3.x

Problem/Motivation

NB: The category of the post is wrong but there wasn't a more relevant one

I don't know if it will be useful to anyone, but since I just tested it, I'll share it.

After installation via Composer of Adaptivetheme 7.1.0 and At Tool 3.1.2 activate the two modules AT Theme Generator (at_theme_generator) and AT Tool (at_tool).
In Appearence -> AT Theme Generator create your custom theme: you will find the recurring message:
“Requires: stable (missing). This theme requires the base theme at_core to operate correctly.”

There is no “bug,” maybe just an oversight.

Open the file at_core.info.yml: and change

name: 'AT Core'
type: theme
base theme: stable
[...]
core_version_requirement: ^10 || ^11
package: adaptivetheme
hidden: true
features:
dependencies:
  - stable:stable

with

name: 'AT Core'
type: theme
base theme: stable9
[...]
core_version_requirement: ^10 || ^11
package: adaptivetheme
hidden: true
features:
dependencies:
  - stable9:stable9

Clear the cache, and your custom theme can now be installed.

From testing, it seems irrelevant whether the 'stable9' theme should or should not be installed.
If done from UI you need to temporarily change “hidden: true” to “hidden: false” the `stable9.info.yml' file.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes