In the 2010 wikitext system, if you click on a category redlink, it gives you an empty category page to edit and at the same time displays what pages are currently in that category.
But in the 2017 wikitext system, if you click on a category redlink, all that appears is an edit box. Since categories don't show up on "what links here", there's no way to see what's in a category before you create a category page...! Can we have the category listing visible when we click on a category redlink?