== Problem
While the basic Gutenburg custom format allows adding a preview without leaving the WordPress editing experience, the editor has to know the exact title of the article they want to add. For disambiguation or other reasons, article are often not named with the exact word(s) we would guess. This can cause waste of time and the impression that the concept they want to link to is not present on Wikipedia.
== Solution
Add article title search/autocomplete to the article title field of the custom format form.
* Uses prefix search to display a list of possible articles after each typed character.
* Shows article title, description, and thumbnail.
* Very similar to search bar on Wikipedia.
* Typing the full title of an article has the same effect as selecting it from the list.
* When a valid article is selected, changing the language will change the selected article to the version in the new language if it exists, otherwise it blanks the article title field.
* Exclude showing disambiguation pages.
* Search within article if text in search field does not match any page/article title.