Latest Posts block: Always includes .columns-3 class

[laurelfulford]

Issue Overview

By default, the Latest Posts block has the .columns-3 class added, causing it to display narrower than the available space.

This is in Gutenberg v 1.9.1.

Expected Behaviour

The posts would display full-width, without this class. Or, the class would be added but the posts would be displayed in three columns, and there would be a column option for the block.

Current Behaviour

The posts display narrower in the editor and on the front end (1/3 of the available space). The list doesn't actually display in three columns.

Screenshots / Video

Editor:

Front-end:

Related Issues and/or PRs

Might be tangentially related to #4010, since it mentions another unexpected class (.aligncenter) being added to this block by default.