MarkdownEditor should allow lazy-loading suggestions #2422
Description
In order to reduce API load and improve time-to-render, we want to lazy-load suggestions in Projects by waiting until the suggestions are actually needed before making the API request (see https://github.com/github/memex/issues/12396). The MarkdownEditor doesn't support this at the moment, so it would like require changing the props to accept functions instead of (or in addition to) the suggestion arrays.
I am already working on this; just opening an issue to track over here.