@WebsiteDeveloper This comment was not addressed in the other pull request:

Since the main selector is a descendent selector, then it matches any div.CodeMirror-cursor.CodeMirror-overwrite inside any .CodeMirror, so I don't think this nested identical rule is necessary. All of the other rules with nested .CodeMirror simple selectors seems to be for changing the look of an inline editor versus the main editor.

I commented it out and the overwrite cursor seems to work in an inline editor. Any other reason it would be necessary?