fix: Select should reset when value change to undefined (#443)

* Should reset when value reset to undefined

* update test case

* skip init value

Author: zombieJ

src/generate.tsx

@@ -377,6 +377,15 @@ export default function generateSelector<
     const baseValue =
       value !== undefined && value !== null ? value : innerValue;
 
+    // Should reset when controlled to be uncontrolled
+    const prevValueRef = React.useRef(value);
+    React.useEffect(() => {
+      if (prevValueRef.current !== value && value === undefined) {
+        setInnerValue(undefined);
+      }
+      prevValueRef.current = value;
+    }, [value]);
+
     /** Unique raw values */
     const mergedRawValue = React.useMemo<RawValueType[]>(
       () =>

tests/Select.test.tsx

@@ -1448,4 +1448,13 @@ describe('Select.Basic', () => {
     wrapper.find('input').simulate('change', 'Z');
     expect(wrapper.find('List').props().data).toHaveLength(1);
   });
+
+  it('reset value to undefined should reset display value', () => {
+    const wrapper = mount(<Select value="light" />);
+    expect(wrapper.find('.rc-select-selection-item').text()).toEqual('light');
+
+    wrapper.setProps({ value: undefined });
+    wrapper.update();
+    expect(wrapper.find('.rc-select-selection-item')).toHaveLength(0);
+  });
 });