fix: table tree not have animate

Author: tangjinzhou

components/dropdown/dropdown.tsx

@@ -10,6 +10,7 @@ import RightOutlined from '@ant-design/icons-vue/RightOutlined';
 import useConfigInject from '../_util/hooks/useConfigInject';
 import devWarning from '../vc-util/devWarning';
 import omit from '../_util/omit';
+import getPlacements from '../tooltip/placements';
 
 export type DropdownProps = Partial<ExtractPropTypes<ReturnType<typeof dropdownProps>>>;
 
@@ -121,10 +122,15 @@ const Dropdown = defineComponent({
       if (triggerActions && triggerActions.indexOf('contextmenu') !== -1) {
         alignPoint = true;
       }
+
+      const builtinPlacements = getPlacements({
+        arrowPointAtCenter: typeof arrow === 'object' && arrow.pointAtCenter,
+      });
       const dropdownProps = omit(
         {
           ...props,
           ...attrs,
+          builtinPlacements,
           overlayClassName: overlayClassNameCustomized,
           arrow,
           alignPoint,

components/dropdown/props.ts

@@ -17,8 +17,15 @@ type Align = {
   useCssBottom?: boolean;
   useCssTransform?: boolean;
 };
+
+export type DropdownArrowOptions = {
+  pointAtCenter?: boolean;
+};
 const dropdownProps = () => ({
-  arrow: PropTypes.looseBool,
+  arrow: {
+    type: [Boolean, Object] as PropType<boolean | DropdownArrowOptions>,
+    default: undefined,
+  },
   trigger: {
     type: [Array, String] as PropType<
       ('click' | 'hover' | 'contextmenu')[] | 'click' | 'hover' | 'contextmenu'