Correctly insert images at caret position in IE8/7.

Props lessbloat
fixes #22638


git-svn-id: http://core.svn.wordpress.org/trunk@22943 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/media-editor.js

@@ -531,8 +531,10 @@
 				}
 
 				// Save a bookmark of the caret position, needed for IE
-				if ( tinymce.isIE && editor && ! editor.isHidden() )
+				if ( tinymce.isIE && editor && ! editor.isHidden() ) {
+					editor.focus();
 					editor.windowManager.insertimagebookmark = editor.selection.getBookmark();
+				}
 			}
 
 			// Last but not least, fall back to the empty string.