Posting this under the heading it deserves: Requesting a page: what makes a good request — what changed since Everything below is what sits behind that.
Nominating something for promotion into the documentation commons.
The topic in question keeps being re-asked, has a good marked solution, and contains a worked example that would be more useful on a page with a review date than buried in a reply. That is exactly the promotion criterion as written.
Objections welcome and genuinely wanted — the whole point of discussing promotions in public is that a bad promotion is harder to undo than a bad reply.