Merge branch 't/10028' into major

CHANGES.md

@@ -3,6 +3,10 @@ CKEditor 4 Changelog
 
 ## CKEditor 4.3
 
+New Features:
+
+* [#10028](http://dev.ckeditor.com/ticket/10028): New option [`config.dialog_noConfirmCancel`](http://docs.ckeditor.com/#!/api/CKEDITOR.config-cfg-dialog_noConfirmCancel).
+
 Fixed Issues:
 
 * [#10612](http://dev.ckeditor.com/ticket/10612): Internet Explorer 11 compatibility issues.

plugins/dialog/plugin.js

@@ -370,7 +370,7 @@ CKEDITOR.DIALOG_RESIZE_BOTH = 3;
 		this.on( 'cancel', function( evt ) {
 			iterContents( function( item ) {
 				if ( item.isChanged() ) {
-					if ( !confirm( editor.lang.common.confirmCancel ) )
+					if ( !editor.config.dialog_noConfirmCancel && !confirm( editor.lang.common.confirmCancel ) )
 						evt.data.hide = false;
 					return true;
 				}
@@ -3116,6 +3116,17 @@ CKEDITOR.plugins.add( 'dialog', {
  * @member CKEDITOR.config
  */
 
+/**
+ * Tells if user should not be asked to confirm close, if any dialog field was modified.
+ * By default it is set to `false` meaning that the confirmation dialog will be shown.
+ *
+ *		config.dialog_noConfirmCancel = true;
+ *
+ * @since 4.3
+ * @cfg {Boolean} [dialog_noConfirmCancel=false]
+ * @member CKEDITOR.config
+ */
+
 /**
  * Fired when a dialog definition is about to be used to create a dialog into
  * an editor instance. This event makes it possible to customize the definition