Widgets: Bump the TinyMCE panels' base z-index to 500001 so they show in the Customizer (such as in the Text widget).

Merges [40990] and [40995] onto 4.8 branch.
Props greuben, westonruter.
Fixes #41158 for 4.8.1.

Built from https://develop.svn.wordpress.org/branches/4.8@41068


git-svn-id: http://core.svn.wordpress.org/branches/4.8@40920 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/customize-controls.js

@@ -5507,6 +5507,13 @@
 			} );
 		} ());
 
+		// Make sure TinyMCE dialogs appear above Customizer UI.
+		$( document ).one( 'wp-before-tinymce-init', function() {
+			if ( ! window.tinymce.ui.FloatPanel.zIndex || window.tinymce.ui.FloatPanel.zIndex < 500001 ) {
+				window.tinymce.ui.FloatPanel.zIndex = 500001;
+			}
+		} );
+
 		api.trigger( 'ready' );
 	});
 

wp-includes/js/tinymce/plugins/wordpress/plugin.js

@@ -1,7 +1,9 @@
 /* global getUserSetting, setUserSetting */
 ( function( tinymce ) {
 // Set the minimum value for the modals z-index higher than #wpadminbar (100000)
-tinymce.ui.FloatPanel.zIndex = 100100;
+if ( tinymce.ui.FloatPanel.zIndex < 100100 ) {
+	tinymce.ui.FloatPanel.zIndex = 100100;
+}
 
 tinymce.PluginManager.add( 'wordpress', function( editor ) {
 	var wpAdvButton, style,