Categories block limits preview to 10 categories

[bradyvercher]

Issue Overview

On a site with 68 categories, only 10 show up in the Categories block preview in the editor.

Steps to Reproduce (for bugs)

1. Add more than 10 categories and make sure they're assigned to posts.
2. Insert a Categories block

Expected Behavior

I expected the preview to match the output on the frontend, where all the categories are displayed.

Screenshots / Video

Editor Preview

Frontend View

Categories Request

[noisysocks]

We can't list all categories in the editor since the API has a hard limit of 100.

I think setting a higher limit (e.g. 50) and having the UI indicate that not all categories are being shown (e.g. by fading out) would be a good compromise between being fully WYSIWYG and performant.

[danielbachhuber]

Related #4623, #4632, #4622

[westonruter]

One alternative would be to use theServerSideRender proposed in #780.