Media: Disable 'Insert gallery' and 'Set featured image' if nothing is queued. Converts selection toolbars to use the newer view manager. props koopersmith, fixes #22714.

git-svn-id: https://develop.svn.wordpress.org/trunk@23024 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/css/media-views.css

@@ -1174,6 +1174,10 @@
 	background: red;
 }
 
+.media-selection .selection-view {
+	display: inline-block;
+}
+
 .media-selection .attachments {
 	display: inline-block;
 	height: 48px;