docs/collapse panel 修复首次为展开状态时，面板高度自适应问题 (#1573)

* docs(collapse-panel): 在已经打开的面板时修改了内容导致高度改变了面板显示不完整

* docs(collapse-panel): 修复首次为展开状态时，面板高度自适应问题

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Co-authored-by: hxh <1047739781>

src/collapse/collapse-panel.tsx

@@ -51,16 +51,23 @@ export default defineComponent({
     const wrapRef = ref();
     const headRef = ref();
     const wrapperHeight = ref('');
+    let isToggle = true;
     const updatePanelState = () => {
       nextTick(() => {
         if (!wrapRef.value) {
           return;
         }
         const { height: headHeight } = headRef.value.getBoundingClientRect();
         if (!isActive.value) {
+          isToggle = false;
           wrapperHeight.value = `${headHeight}px`;
           return;
         }
+        if (isToggle) {
+          isToggle = false;
+          wrapperHeight.value = 'auto';
+          return;
+        }
         setContentWrapperHeight();
       });
     };