fix: input textarea自适应高度优化

Author: okaychen

package.json

@@ -1,6 +1,6 @@
 {
     "name": "santd",
-    "version": "1.1.1",
+    "version": "1.1.3",
     "description": "san UI design",
     "scripts": {
         "start": "cross-env NODE_ENV=development node scripts/preview.js",

src/input/Textarea.js

@@ -21,9 +21,17 @@ export default san.defineComponent({
             let defaultValue = this.data.get('defaultValue') || '';
             this.data.set('value', defaultValue);
         }
+
+        // textarea height changed reset
+        this.resizeObserver = new ResizeObserver(entries => {
+            for (let entry of entries) {
+                entry.contentRect && this.resizeTextarea();
+            }
+        });
+        this.resizeObserver.observe(this.el);
     },
-    updated() {
-        this.resizeTextarea();
+    detached() {
+        this.resizeObserver.disconnect();
     },
     resizeTextarea() {
         let autosize = this.data.get('autosize');