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frontend/node_modules/antd/es/button/style/group.js

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+const genButtonBorderStyle = (buttonTypeCls, borderColor) => ({
+  // Border
+  [`> span, > ${buttonTypeCls}`]: {
+    '&:not(:last-child)': {
+      [`&, & > ${buttonTypeCls}`]: {
+        '&:not(:disabled)': {
+          borderInlineEndColor: borderColor
+        }
+      }
+    },
+    '&:not(:first-child)': {
+      [`&, & > ${buttonTypeCls}`]: {
+        '&:not(:disabled)': {
+          borderInlineStartColor: borderColor
+        }
+      }
+    }
+  }
+});
+const genGroupStyle = token => {
+  const {
+    componentCls,
+    fontSize,
+    lineWidth,
+    groupBorderColor,
+    colorErrorHover
+  } = token;
+  return {
+    [`${componentCls}-group`]: [{
+      position: 'relative',
+      display: 'inline-flex',
+      // Border
+      [`> span, > ${componentCls}`]: {
+        '&:not(:last-child)': {
+          [`&, & > ${componentCls}`]: {
+            borderStartEndRadius: 0,
+            borderEndEndRadius: 0
+          }
+        },
+        '&:not(:first-child)': {
+          marginInlineStart: token.calc(lineWidth).mul(-1).equal(),
+          [`&, & > ${componentCls}`]: {
+            borderStartStartRadius: 0,
+            borderEndStartRadius: 0
+          }
+        }
+      },
+      [componentCls]: {
+        position: 'relative',
+        zIndex: 1,
+        '&:hover, &:focus, &:active': {
+          zIndex: 2
+        },
+        '&[disabled]': {
+          zIndex: 0
+        }
+      },
+      [`${componentCls}-icon-only`]: {
+        fontSize
+      }
+    },
+    // Border Color
+    genButtonBorderStyle(`${componentCls}-primary`, groupBorderColor), genButtonBorderStyle(`${componentCls}-danger`, colorErrorHover)]
+  };
+};
+export default genGroupStyle;