Add `pristine` to `UserEdit` and `ServerNotice` (#185)

src/components/ServerNotices.js

@@ -24,7 +24,10 @@ const ServerNoticeDialog = ({ open, loading, onClose, onSend }) => {
 
   const ServerNoticeToolbar = props => (
     <Toolbar {...props}>
-      <SaveButton label="resources.servernotices.action.send" />
+      <SaveButton
+        label="resources.servernotices.action.send"
+        disabled={props.pristine}
+      />
       <Button label="ra.action.cancel" onClick={onClose}>
         <IconCancel />
       </Button>

src/components/users.js

@@ -238,7 +238,7 @@ const UserEditToolbar = props => {
   const translate = useTranslate();
   return (
     <Toolbar {...props}>
-      <SaveButton submitOnEnter={true} />
+      <SaveButton submitOnEnter={true} disabled={props.pristine} />
       <DeleteButton
         label="resources.users.action.erase"
         confirmTitle={translate("resources.users.helper.erase", {