TinyMCE: fix black outline around `_moz_abspos`. This is added in Firefox in paragraphs inserted after a non-editable block.

See #38757.
Built from https://develop.svn.wordpress.org/trunk@39217


git-svn-id: http://core.svn.wordpress.org/trunk@39157 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/tinymce/skins/wordpress/wp-content.css

@@ -211,6 +211,11 @@ audio {
 	visibility: hidden;
 }
 
+/* Fix for proprietary Mozilla display attribute, see #38757 */
+[_moz_abspos] {
+	outline: none;
+}
+
 a[data-wplink-url-error],
 a[data-wplink-url-error]:hover,
 a[data-wplink-url-error]:focus {

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-beta3-39216';
+$wp_version = '4.7-beta3-39217';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.