Update/Install: Provide basic back-compat styling for the `.update-message` CSS class in the plugins list table.

This change restores only the margin and padding styles for the `.update-message` class when used by plugins in the context of adding arbitrary rows to the list table. The inline-update colors and icon styles were not restored, expressly with a wide variety of plugin use-cases in mind.

Merge of [38237] to the 4.6 branch.

Props ovann86, rahulsprajapati, ocean90, DrewAPicture.
Props helen for review.
Fixes #37504. 

Built from https://develop.svn.wordpress.org/branches/4.6@38238


git-svn-id: http://core.svn.wordpress.org/branches/4.6@38179 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/common-rtl.css

@@ -1308,6 +1308,10 @@ div.error {
 	padding: 1px 12px;
 }
 
+div[class="update-message"] { /* back-compat for pre-4.6 */
+	padding: 0.5em 0 0.5em 12px;
+}
+
 .notice p,
 .notice-title,
 div.updated p,

wp-admin/css/common.css

@@ -1308,6 +1308,10 @@ div.error {
 	padding: 1px 12px;
 }
 
+div[class="update-message"] { /* back-compat for pre-4.6 */
+	padding: 0.5em 12px 0.5em 0;
+}
+
 .notice p,
 .notice-title,
 div.updated p,

wp-admin/css/list-tables-rtl.css

@@ -1350,7 +1350,8 @@ ul.cat-checklist {
 	padding: 0;
 }
 
-.plugins .plugin-update-tr .notice {
+.plugins .plugin-update-tr .notice,
+.plugins .plugin-update-tr div[class="update-message"] { /* back-compat for pre-4.6 */
 	margin: 5px 40px 15px 20px;
 }
 

wp-admin/css/list-tables.css

@@ -1350,7 +1350,8 @@ ul.cat-checklist {
 	padding: 0;
 }
 
-.plugins .plugin-update-tr .notice {
+.plugins .plugin-update-tr .notice,
+.plugins .plugin-update-tr div[class="update-message"] { /* back-compat for pre-4.6 */
 	margin: 5px 20px 15px 40px;
 }
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-RC1-38236';
+$wp_version = '4.6-RC1-38238';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.