fix: ! do nothing when item is postponed to a date that is already set

Author: ilandikov

src/ui/Menus/PostponeMenu.ts

@@ -51,6 +51,9 @@ export class PostponeMenu extends TaskEditingMenu {
 
                 if (task[dateFieldToPostpone]?.isSame(postponedDate, 'day')) {
                     item.setChecked(true);
+                    // Workaround solution for https://github.com/obsidian-tasks-group/obsidian-tasks/issues/2816
+                    // Do nothing when the checked item is clicked
+                    item.onClick(() => null);
                 }
             }
         };