Validate hex colors when creating/editing labels (#34623)

Resolves #34618.

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/features/comp/LabelEdit.ts

@@ -70,7 +70,7 @@ export function initCompLabelEdit(pageSelector: string) {
           form.reportValidity();
           return false;
         }
-        form.submit();
+        form.dispatchEvent(new Event('submit', {bubbles: true}));
       },
     }).modal('show');
   };