Requested at T373711#11466069. This is needed to have feature parity with CodeEditor. I suppose it should be a preference, default OFF for wikitext.
CodeMirror 6 does not offer grid lines as part of the library (ref). Some inspiration for a concise solution may be found at https://gist.github.com/s-cork/898cd7c21e55a4963132cb9d9e2c6615
| Subject | Repo | Branch | Lines +/- | |
|---|---|---|---|---|
| indentGuides: new extension | mediawiki/extensions/CodeMirror | master | +95 -0 |
We will still look at this, but I don't think it's a hard requirement for replacing CodeEditor.
Change #1281556 had a related patch set uploaded (by Bhsd; author: Bhsd):
[mediawiki/extensions/CodeMirror@master] indentGuides: new extension