Make the responsive layout behave better when the user zooms the page:

* Change the smartphone media query from 480 to 600px so it captures large screen phones in landscape mode.
* Set #wpadminbar to position: absolute at smartphone sizes so it scrolls with the page, freeing up the viewport.
* Remove the transition states on #adminmenu for better performance on mobile devices
* Make the responsive sidebar scroll with the page instead of using a fixed position
* Remove the -webkit-overflow-scrolling rule that was disabling scroll-to-top when tapping the iOS status bar.
* Remove unnecessary zoom declaration from -ms-viewport.

See #25858.


Built from https://develop.svn.wordpress.org/trunk@26373


git-svn-id: http://core.svn.wordpress.org/trunk@26273 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/css/admin-bar.css

@@ -938,15 +938,12 @@
 	}
 }
 
-/* Horizontal */
-@media screen and (max-width: 480px) and (orientation: landscape) {
+/* Smartphone */
+@media screen and (max-width: 600px) {
 	#wpadminbar {
 		position: absolute;
 	}
-}
-
-/* Smartphone */
-@media screen and (max-width: 480px) {
+	
 	#moby6-overlay {
 		position: fixed;
 		top: 0;