From 0e8a6dbffcaddc640475f85ae30b4b844df8d402 Mon Sep 17 00:00:00 2001
From: Stefanibus <stefan.brueck@posteo.de>
Date: Thu, 24 Jun 2021 16:02:12 +0200
Subject: [PATCH] avoid React.StrictMode warning in dev-mode (from MUI)

see https://github.com/mui-org/material-ui/issues/13394 and https://material-ui.com/customization/theming/
---
 src/App.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/App.js b/src/App.js
index 28b1f1d..29e3c95 100644
--- a/src/App.js
+++ b/src/App.js
@@ -2,11 +2,12 @@ import CssBaseline    from '@material-ui/core/CssBaseline';
 import Container      from '@material-ui/core/Container';
 import Header         from './components/Header';
 import List           from './components/List';
-import { ThemeProvider, createMuiTheme } from '@material-ui/core/styles';
+import { ThemeProvider, unstable_createMuiStrictModeTheme } from '@material-ui/core/styles';
+
 import './App.css';
 
 
-const evTheme = createMuiTheme({
+const evTheme = unstable_createMuiStrictModeTheme({
       overrides: {
       MuiCardHeader: {
         root: {