Twenty Nineteen: avoid columns set to full width to extend beyond editor bounds.

This changeset applies `max-width` and `margin` CSS rules when `block-editor-writing-flow` and `editor-styles-wrapper` classes are on the same element.

Props charleyparkerdesign, sabernhardt, smit08, sclayf1.
Fixes #54169.

Built from https://develop.svn.wordpress.org/trunk@52925


git-svn-id: http://core.svn.wordpress.org/trunk@52514 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/twentynineteen/style-editor.css

@@ -605,6 +605,7 @@ body .wp-block.aligncenter {
 }
 
 @media only screen and (min-width: 768px) {
+  body.block-editor-writing-flow,
   body .block-editor-writing-flow {
     max-width: 80%;
     margin: 0 10%;

wp-content/themes/twentynineteen/style-editor.scss

@@ -36,6 +36,7 @@ body {
 
 	@include media(tablet) {
 
+		&.block-editor-writing-flow,
 		.block-editor-writing-flow {
 			max-width: 80%;
 			margin: 0 10%;

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.0-alpha-52924';
+$wp_version = '6.0-alpha-52925';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.