chore: remove warning of cssinjs in Space.Compact (#52489)

Author: afc163

components/button/style/compact.ts

@@ -11,21 +11,20 @@ import { prepareComponentToken, prepareToken } from './token';
 const genButtonCompactStyle: GenerateStyle<ButtonToken> = (token) => {
   const { componentCls, colorPrimaryHover, lineWidth, calc } = token;
   const insetOffset = calc(lineWidth).mul(-1).equal();
-  const getCompactBorderStyle = (vertical?: boolean) =>
-    ({
-      [`${componentCls}-compact${vertical ? '-vertical' : ''}-item${componentCls}-primary:not([disabled])`]:
-        {
-          '& + &::before': {
-            position: 'absolute',
-            top: vertical ? insetOffset : 0,
-            insetInlineStart: vertical ? 0 : insetOffset,
-            backgroundColor: colorPrimaryHover,
-            content: '""',
-            width: vertical ? '100%' : lineWidth,
-            height: vertical ? lineWidth : '100%',
-          },
-        },
-    }) as CSSObject;
+  const getCompactBorderStyle = (vertical?: boolean) => {
+    const selector = `${componentCls}-compact${vertical ? '-vertical' : ''}-item${componentCls}-primary:not([disabled])`;
+    return {
+      [`${selector} + ${selector}::before`]: {
+        position: 'absolute',
+        top: vertical ? insetOffset : 0,
+        insetInlineStart: vertical ? 0 : insetOffset,
+        backgroundColor: colorPrimaryHover,
+        content: '""',
+        width: vertical ? '100%' : lineWidth,
+        height: vertical ? lineWidth : '100%',
+      } as CSSObject,
+    };
+  };
   // Special styles for Primary Button
   return {
     ...getCompactBorderStyle(),