Editor scrolling:

* Make sure the background color for tools is only applied to the main editor.
* Fix toolbar width for smaller screens.
* Ensure toolbar doesn't end up in a weird place when scrolling down too fast.
* Avoid JS errors for post types that don't support the editor.

props avryl. see #28328.

Built from https://develop.svn.wordpress.org/trunk@29075


git-svn-id: http://core.svn.wordpress.org/trunk@28861 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/common-rtl.css

@@ -2642,10 +2642,6 @@ img {
 		-webkit-tap-highlight-color: rgba(0, 0, 0, 0) !important;
 	}
 
-	#wpwrap {
-		background: #f0f0f0;
-	}
-
 	#wpcontent {
 		position: relative;
 		margin-right: 0;