Fire 'saveSnapshot' in setData.

core/editor.js

@@ -939,13 +939,20 @@
 		 * @param {Boolean} internal Whether to suppress any event firing when copying data internally inside the editor.
 		 */
 		setData: function( data, callback, internal ) {
+			!internal && this.fire( 'saveSnapshot' );
+
 			if ( callback ) {
-				this.on( 'dataReady', function( evt ) {
-					evt.removeListener();
+				this.once( 'dataReady', function( evt ) {
 					callback.call( evt.editor );
 				} );
 			}
 
+			if ( !internal ) {
+				this.once( 'dataReady', function( evt ) {
+					this.fire( 'saveSnapshot' );
+				} );
+			}
+
 			// Fire "setData" so data manipulation may happen.
 			var eventData = { dataValue: data };
 			!internal && this.fire( 'setData', eventData );