fix: upload height error, close #5298

Author: tangjinzhou

components/upload/UploadList/listAnimation.ts

@@ -2,15 +2,15 @@ import { addClass, removeClass } from '../../vc-util/Dom/class';
 import { nextTick } from 'vue';
 import type { CSSMotionProps } from '../../_util/transition';
 
-const listAnimation = (name): CSSMotionProps => {
+const listAnimation = (name = 'ant-motion-collapse'): CSSMotionProps => {
   return {
     name,
     appear: true,
     css: true,
     onBeforeEnter: (node: HTMLDivElement) => {
-      addClass(node, name);
       node.style.height = '0px';
       node.style.opacity = '0';
+      addClass(node, name);
     },
     onEnter: (node: HTMLDivElement) => {
       nextTick(() => {
@@ -19,14 +19,16 @@ const listAnimation = (name): CSSMotionProps => {
       });
     },
     onAfterEnter: (node: HTMLDivElement) => {
-      if (node) removeClass(node, name);
-      node.style.height = undefined;
-      node.style.opacity = undefined;
+      if (node) {
+        removeClass(node, name);
+        node.style.height = null;
+        node.style.opacity = null;
+      }
     },
     onBeforeLeave: (node: HTMLDivElement) => {
       addClass(node, name);
       node.style.height = `${node.offsetHeight}px`;
-      node.style.opacity = undefined;
+      node.style.opacity = null;
     },
     onLeave: (node: HTMLDivElement) => {
       setTimeout(() => {
@@ -35,9 +37,13 @@ const listAnimation = (name): CSSMotionProps => {
       });
     },
     onAfterLeave: (node: HTMLDivElement) => {
-      if (node) removeClass(node, name);
-      node.style.height = undefined;
-      node.style.opacity = undefined;
+      if (node) {
+        removeClass(node, name);
+        if (node.style) {
+          node.style.height = null;
+          node.style.opacity = null;
+        }
+      }
     },
   };
 };