fix: avoid closing dropdown on input mousedown in multiple mode

Author: QDyanbing

src/SelectInput/index.tsx

@@ -180,13 +180,23 @@ export default React.forwardRef<SelectInputRef, SelectInputProps>(function Selec
       // so we need to mark the event directly
       (event.nativeEvent as any)._ori_target = inputDOM;
 
+      const target = event.target as Node | null;
+      const isClickOnInput =
+        !!inputDOM && !!target && (target === inputDOM || inputDOM.contains(target));
+
       if (inputDOM && event.target !== inputDOM && !inputDOM.contains(event.target as Node)) {
         event.preventDefault();
       }
 
       // Check if we should prevent closing when clicking on selector
       // Don't close if: open && not multiple && (combobox mode || showSearch)
-      const shouldPreventClose = triggerOpen && !multiple && (mode === 'combobox' || showSearch);
+      const shouldPreventCloseOnSingle =
+        triggerOpen && !multiple && (mode === 'combobox' || showSearch);
+
+      // Don't close if: open && multiple && click on input
+      const shouldPreventCloseOnMultipleInput = triggerOpen && !!multiple && isClickOnInput;
+
+      const shouldPreventClose = shouldPreventCloseOnSingle || shouldPreventCloseOnMultipleInput;
 
       if (!(event.nativeEvent as any)._select_lazy) {
         inputRef.current?.focus();

tests/Multiple.test.tsx

@@ -712,5 +712,22 @@ describe('Select.Multiple', () => {
       toggleOpen(container);
       expect(container.querySelector('input')).toHaveValue('');
     });
+
+    it('should not close dropdown when mousedown on input in multiple mode (text selection)', () => {
+      const { container } = render(
+        <Select mode="multiple" showSearch options={[{ value: 'light' }]} />,
+      );
+
+      const input = container.querySelector('input') as HTMLInputElement;
+
+      // Open dropdown first
+      toggleOpen(container);
+      expectOpen(container, true);
+
+      // Start interaction from input (simulate starting text selection / cursor move)
+      fireEvent.mouseDown(input);
+
+      expectOpen(container, true);
+    });
   });
 });