In GTK4 the EmojiChooser is public API.
Created attachment 400816 [details] Patch
Thanks for the patch. If this patch contains new public API please make sure it follows the guidelines for new WebKit2 GTK+ API. See http://trac.webkit.org/wiki/WebKitGTK/AddingNewWebKit2API
Committed r262482: <https://trac.webkit.org/changeset/262482>