fix: Vertical also support inlineCollapsed (#400)

Author: zombieJ

src/Menu.tsx

@@ -205,7 +205,7 @@ const Menu: React.FC<MenuProps> = props => {
   const [mergedMode, mergedInlineCollapsed] = React.useMemo<
     [MenuMode, boolean]
   >(() => {
-    if (mode === 'inline' && inlineCollapsed) {
+    if ((mode === 'inline' || mode === 'vertical') && inlineCollapsed) {
       return ['vertical', inlineCollapsed];
     }
     return [mode, false];

tests/Collapsed.spec.js

@@ -262,6 +262,12 @@ describe('Menu.Collapsed', () => {
         wrapper.find('li.rc-menu-item-selected').getDOMNode().textContent,
       ).toBe('Option 1');
     });
+
+    it('vertical also support inlineCollapsed', () => {
+      const wrapper = mount(<Menu mode="vertical" inlineCollapsed />);
+
+      expect(wrapper.exists('.rc-menu-inline-collapsed')).toBeTruthy();
+    });
   });
 });
 /* eslint-enable */