fix(textarea): autofocus until component is fully rendered (#5153)

* fix(textarea): defer focus until component is fully rendered

* fix(textarea): autofocus after the element exists

* chore: lint code

Author: RSS1102

packages/components/textarea/textarea.tsx

@@ -185,17 +185,11 @@ export default defineComponent({
     watch(refTextareaElem, (el) => {
       if (!el) return;
       adjustTextareaHeight();
+      if (props.autofocus) {
+        el.focus();
+      }
     });
 
-    watch(
-      () => props.autofocus,
-      (val) => {
-        if (val) {
-          refTextareaElem.value.focus();
-        }
-      },
-    );
-
     watch(textareaStyle, (val) => {
       const { style } = attrs as { style: StyleValue };
       if (isObject(style)) {