Twenty Twelve: Fixes submenu hiding under slideshow block.

Whilst initially this could be thought to be solved in Jetpack due to submenus only having a z-index of 1 a fix is desirable. This brings in the suggested value.

Props robertghetau, SergeyBiryukov, sabernhardt, poena, narenin.
Fixes #55892.

Built from https://develop.svn.wordpress.org/trunk@58776


git-svn-id: http://core.svn.wordpress.org/trunk@58178 1a063a9b-81f0-0310-95a4-ce76da25c4cd

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

@@ -108,7 +108,7 @@ body.full-width .site-content {
 	padding: 0;
 	position: absolute;
 	top: 100%;
-	z-index: 1;
+	z-index: 99999;
 	height: 1px;
 	width: 1px;
 	overflow: hidden;

wp-content/themes/twentytwelve/style.css

@@ -1606,7 +1606,7 @@ img#wpstats {
 		padding: 0;
 		position: absolute;
 		top: 100%;
-		z-index: 1;
+		z-index: 99999;
 		height: 1px;
 		width: 1px;
 		overflow: hidden;

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58775';
+$wp_version = '6.7-alpha-58776';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.