Fix:ConfirmDialog：confirmDialog method in unstyled mode, the pop-up w…

…indow style not apply (#5776)

components/lib/confirmdialog/ConfirmDialog.js

@@ -34,8 +34,18 @@ export const ConfirmDialog = React.memo(
         const confirmProps = React.useRef(null);
         const isCallbackExecuting = React.useRef(false);
         const focusElementOnHide = React.useRef(null);
-        const getCurrentProps = () => confirmProps.current || props;
-        const getPropValue = (key) => (confirmProps.current || props)[key];
+
+        const getCurrentProps = () => {
+            let group = props.group;
+
+            if (confirmProps.current) {
+                group = confirmProps.current.group;
+            }
+
+            return Object.assign({}, props, confirmProps.current, { group });
+        };
+
+        const getPropValue = (key) => getCurrentProps()[key];
         const callbackFromProp = (key, ...param) => ObjectUtils.getPropValue(getPropValue(key), param);
 
         const acceptLabel = getPropValue('acceptLabel') || localeOption('accept');