Widgets: Add missing `wp-editor-area` CSS class for `textarea` in the TinyMCE-extended Text widget to ensure proper styles are applied.

Removes extra border around TinyMCE-wrapped `textarea` and removes gap at bottom due to lack of `display:block`.

Props johnjamesjacoby, westonruter.
See #35243.
Fixes #40755.

Built from https://develop.svn.wordpress.org/trunk@40675


git-svn-id: http://core.svn.wordpress.org/trunk@40538 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-beta1-40674';
+$wp_version = '4.8-beta1-40675';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.

wp-includes/widgets/class-wp-widget-text.php

@@ -196,7 +196,7 @@ class WP_Widget_Text extends WP_Widget {
 			</p>
 			<p>
 				<label for="{{ elementIdPrefix }}text" class="screen-reader-text"><?php esc_html_e( 'Content:' ); ?></label>
-				<textarea id="{{ elementIdPrefix }}text" class="widefat text" style="height: 200px" rows="16" cols="20"></textarea>
+				<textarea id="{{ elementIdPrefix }}text" class="widefat text wp-editor-area" style="height: 200px" rows="16" cols="20"></textarea>
 			</p>
 		</script>
 		<?php