Fix useless AppBar rerenders

examples/simple/src/Layout.js

@@ -1,5 +1,5 @@
 import * as React from 'react';
-import { forwardRef } from 'react';
+import { forwardRef, memo } from 'react';
 import { Layout, AppBar, UserMenu, useLocale, useSetLocale } from 'react-admin';
 import { MenuItem, ListItemIcon } from '@material-ui/core';
 import { makeStyles } from '@material-ui/core/styles';
@@ -39,6 +39,6 @@ const MyUserMenu = props => (
     </UserMenu>
 );
 
-const MyAppBar = props => <AppBar {...props} userMenu={<MyUserMenu />} />;
+const MyAppBar = memo(props => <AppBar {...props} userMenu={<MyUserMenu />} />);
 
 export default props => <Layout {...props} appBar={MyAppBar} />;

examples/simple/src/posts/PostList.js

@@ -160,7 +160,7 @@ const PostList = props => {
                         reference="tags"
                         source="tags"
                         sortBy="tags.name"
-                        sort={{ field: 'name', order: 'ASC' }}
+                        sort={tagSort}
                         cellClassName={classes.hiddenOnSmallScreens}
                         headerClassName={classes.hiddenOnSmallScreens}
                     >
@@ -178,4 +178,6 @@ const PostList = props => {
     );
 };
 
+const tagSort = { field: 'name', order: 'ASC' };
+
 export default PostList;

packages/ra-core/src/controller/field/useReferenceArrayFieldController.ts

@@ -24,6 +24,7 @@ interface Option {
     source: string;
 }
 
+const emptyArray = [];
 const defaultFilter = {};
 const defaultSort = { field: null, order: null };
 
@@ -65,7 +66,7 @@ const useReferenceArrayFieldController = (
     } = props;
     const resource = useResourceContext(props);
     const notify = useNotify();
-    const ids = get(record, source) || [];
+    const ids = get(record, source) || emptyArray;
     const { data, error, loading, loaded } = useGetMany(reference, ids, {
         onFailure: error =>
             notify(

packages/ra-core/src/core/CoreAdminUI.tsx

@@ -1,5 +1,10 @@
 import * as React from 'react';
-import { createElement, FunctionComponent, ComponentType } from 'react';
+import {
+    createElement,
+    FunctionComponent,
+    ComponentType,
+    useMemo,
+} from 'react';
 import { Switch, Route } from 'react-router-dom';
 
 import CoreAdminRouter from './CoreAdminRouter';
@@ -54,6 +59,9 @@ const CoreAdminUI: FunctionComponent<AdminUIProps> = ({
     theme,
     title = 'React Admin',
 }) => {
+    const logoutElement = React.useMemo(() => logout && createElement(logout), [
+        logout,
+    ]);
     return (
         <Switch>
             {loginPage !== false && loginPage !== true ? (
@@ -78,7 +86,7 @@ const CoreAdminUI: FunctionComponent<AdminUIProps> = ({
                         dashboard={dashboard}
                         layout={layout}
                         loading={loading}
-                        logout={logout && createElement(logout)}
+                        logout={logoutElement}
                         menu={menu}
                         ready={ready}
                         theme={theme}

packages/ra-ui-materialui/src/field/BooleanField.tsx

@@ -59,9 +59,16 @@ export const BooleanField: FC<BooleanFieldProps> = memo<BooleanFieldProps>(
                 >
                     <Tooltip title={translate(ariaLabel, { _: ariaLabel })}>
                         {value === true ? (
-                            <TrueIcon data-testid="true" fontSize="small" />
+                            <span>
+                                <TrueIcon data-testid="true" fontSize="small" />
+                            </span>
                         ) : (
-                            <FalseIcon data-testid="false" fontSize="small" />
+                            <span>
+                                <FalseIcon
+                                    data-testid="false"
+                                    fontSize="small"
+                                />
+                            </span>
                         )}
                     </Tooltip>
                 </Typography>

packages/ra-ui-materialui/src/layout/AppBar.tsx

@@ -1,5 +1,5 @@
 import * as React from 'react';
-import { Children, cloneElement } from 'react';
+import { Children, cloneElement, memo } from 'react';
 import PropTypes from 'prop-types';
 import { useDispatch } from 'react-redux';
 import classNames from 'classnames';
@@ -195,4 +195,4 @@ export interface AppBarProps extends Omit<MuiAppBarProps, 'title' | 'classes'> {
     userMenu?: JSX.Element | boolean;
 }
 
-export default AppBar;
+export default memo(AppBar);