From April 15, you can enable line numbering in some wikitext editors - for now in the template namespace, coming to more namespaces soon. This will make it easier to detect line breaks and to refer to a particular line in discussions. These numbers will be shown if you enable the syntax highlighting feature (CodeMirror extension), which is supported in the 2010 and 2017 wikitext editors.
More information can be found on this project page. Everyone is invited to test the feature, and to give feedback on this talk page.
-- Johanna Strodt (WMDE) 17:07, 12 abr 2021 (CEST)