fix: correct preserved page calculation on pageSize change

Author: 刘欢

src/Pagination.tsx

@@ -197,7 +197,7 @@ const Pagination: React.FC<PaginationProps> = (props) => {
   }
 
   function changePageSize(size: number) {
-    const preservedPage = Math.ceil((current * pageSize) / size);
+    const preservedPage = Math.floor(((current - 1) * pageSize) / size) + 1;
     const newCurrent = calculatePage(size, pageSize, total);
     const recommendPage =
       newCurrent === 0 ? 1 : Math.min(preservedPage, newCurrent);

tests/simple.test.tsx

@@ -131,7 +131,7 @@ describe('simple Pagination', () => {
     const pageSize1 = container.querySelectorAll('.rc-select-item')[0];
     fireEvent.click(pageSize1);
     expect(onChange).toHaveBeenCalled();
-    expect(onChange).toHaveBeenLastCalledWith(1, 10, 2);
+    expect(onChange).toHaveBeenLastCalledWith(1, 10, 1);
   });
 
   it('should support keyboard event', () => {

tests/sizer.test.tsx

@@ -67,7 +67,7 @@ describe('Pagination with sizer', () => {
     const pageSize1 = container.querySelectorAll('.rc-select-item')[0];
     fireEvent.click(pageSize1);
     expect(onChange).toHaveBeenCalled();
-    expect(onChange).toHaveBeenLastCalledWith(1, 10, 2);
+    expect(onChange).toHaveBeenLastCalledWith(1, 10, 1);
   });
 
   // https://github.com/ant-design/ant-design/issues/26580