update

libraries/Simple-Gant-master/frappe-gantt.js

@@ -1426,8 +1426,8 @@ class Gantt {
 
 				}
 			}
-			if(s)
-				task.end=s.end;
+			if(s && this.options.sync_parent_end_with_children)
+				 task.end=s.end;
 			task.has=this.get_all_dependent_tasks(task.id);
 
 			return task;
@@ -1666,7 +1666,8 @@ class Gantt {
             date_format: 'YYYY-MM-DD',
             popup_trigger: 'click',
             custom_popup_html: null,
-            language: 'en'
+            language: 'en',
+            sync_parent_end_with_children: true
         };
         this.options = Object.assign({}, default_options, options);
     }
@@ -2747,3 +2748,5 @@ function generate_id(task) {
 return Gantt;
 
 }());
+
+