Twenty Twelve: Fix issues with theme's Gutenberg support.

A handful of issues were missed in Twenty Twelve's Gutenberg support, added in #45040. This commit includes the following fixes:

* Update editor placeholder text to use the correct font family.
* Center text and bullets in list-based widget blocks, when block itself is centered.
* Include non "image" variations of the Cover block classes `.wp-block-cover` and `.wp-block-cover-text` in the styles.
* Add spacing underneath the Media & Text block, but make sure final paragraph in the block doesn't add too much space.
* Simplify selectors used to set editor width to just `.wp-block`.


Props pento, davidakennedy.
Fixes #45240.


Built from https://develop.svn.wordpress.org/branches/5.0@43871


git-svn-id: http://core.svn.wordpress.org/branches/5.0@43700 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/twentytwelve/css/blocks.css

@@ -127,9 +127,10 @@ p.has-drop-cap:not(:focus)::first-letter {
 	width: 100%;
 }
 
-/* Cover Image */
+/* Cover */
 
-.wp-block-cover-image.aligncenter {
+.wp-block-cover-image.aligncenter,
+.wp-block-cover.aligncenter {
 	display: flex;
 }
 
@@ -296,10 +297,30 @@ pre.wp-block-code {
 	border: 0;
 }
 
+/* Media & Text */
+
+.wp-block-media-text {
+	margin-bottom: 24px;
+	margin-bottom: 1.714285714rem;
+}
+
+.wp-block-media-text *:last-child {
+	margin-bottom: 0;
+}
+
 /*--------------------------------------------------------------
 5.0 Blocks - Widgets
 --------------------------------------------------------------*/
 
+/* Archives, Categories & Latest Posts */
+
+.wp-block-archives.aligncenter,
+.wp-block-categories.aligncenter,
+.wp-block-latest-posts.aligncenter {
+	list-style-position: inside;
+	text-align: center;
+}
+
 /* Latest Comments */
 
 .wp-block-latest-comments {

wp-content/themes/twentytwelve/css/editor-blocks.css

@@ -24,6 +24,10 @@ Description: Used to style Gutenberg Blocks in the editor.
 	font-size: 14px;
 }
 
+.editor-default-block-appender input[type="text"].editor-default-block-appender__content {
+	font-family: "Open Sans", Helvetica, Arial, sans-serif;
+}
+
 .edit-post-visual-editor .editor-block-list__block {
 	color: #444;
 }
@@ -70,10 +74,8 @@ Description: Used to style Gutenberg Blocks in the editor.
 
 /* Main column width */
 
-body.gutenberg-editor-page .edit-post-visual-editor .editor-post-title__block,
-body.gutenberg-editor-page .edit-post-visual-editor .editor-default-block-appender,
-body.gutenberg-editor-page .edit-post-visual-editor .editor-block-list__block {
-	max-width: 655px;
+.wp-block {
+	max-width: 655px; /* 625px + 30px for padding */
 }
 
 /* Link styles */
@@ -218,9 +220,10 @@ p.has-drop-cap:not(:focus)::first-letter {
 	font-size: 18px;
 }
 
-/* Cover Image */
+/* Cover */
 
-.edit-post-visual-editor .editor-block-list__block .wp-block-cover-image p {
+.edit-post-visual-editor .editor-block-list__block .wp-block-cover-image p,
+.edit-post-visual-editor .editor-block-list__block .wp-block-cover p {
 	font-size: 28px;
 }
 
@@ -359,11 +362,26 @@ p.has-drop-cap:not(:focus)::first-letter {
 	margin-right: auto;
 }
 
+/* Media & Text */
+
+.wp-block-media-text *:last-child {
+	margin-bottom: 0;
+}
+
 /*--------------------------------------------------------------
 6.0 Blocks - Widgets
 --------------------------------------------------------------*/
 
+/* Archives, Categories & Latest Posts */
+
+[data-align="center"] .wp-block-archives ul,
+[data-align="center"] .wp-block-categories ul,
+[data-align="center"] .wp-block-latest-posts ul {
+	list-style-position: inside;
+}
+
 /* Archives */
+
 .gutenberg ul.wp-block-archives {
 	padding-left: 0;
 }

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-beta3-43870';
+$wp_version = '5.0-beta3-43871';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.