fix(textarea): float label when a value is changed async (#18024)

emits styles to the parent item on value change so that the item will get the proper class to float the label

fixes #17555 fixes #17559

core/src/components/textarea/textarea.tsx

@@ -134,6 +134,7 @@ export class Textarea implements ComponentInterface {
     if (nativeInput && nativeInput.value !== value) {
       nativeInput.value = value;
     }
+    this.emitStyle();
     this.ionChange.emit({ value });
   }