TinyMCE wpView: add small delay before inserting wpview sandbox iframes into the DOM. Fixes a problem in Firefox that may prevent rendering them. Fixes #29241.

Built from https://develop.svn.wordpress.org/trunk@29513


git-svn-id: http://core.svn.wordpress.org/trunk@29290 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/mce-view.js

@@ -127,6 +127,9 @@ window.wp = window.wp || {};
 
 					content.innerHTML = '';
 
+					// Seems Firefox needs a bit of time to insert/set the view nodes, or the iframe will fail
+					// especially when switching Text => Visual.
+					setTimeout( function() {
 						iframe = dom.add( content, 'iframe', {
 							src: tinymce.Env.ie ? 'javascript:""' : '',
 							frameBorder: '0',
@@ -174,6 +177,7 @@ window.wp = window.wp || {};
 								setTimeout( resize, i * 700 );
 							}
 						}
+					}, 50 );
 				});
 			} else {
 				this.setContent( html );