Display '(edited)' next to edited polls (#7789)

src/components/views/messages/MPollBody.tsx

@@ -400,8 +400,14 @@ export default class MPollBody extends React.Component<IBodyProps, IState> {
             totalText = _t("Based on %(count)s votes", { count: totalVotes });
         }
 
+        const editedSpan = (
+            this.props.mxEvent.replacingEvent()
+                ? <span className="mx_MPollBody_edited"> ({ _t("edited") })</span>
+                : null
+        );
+
         return <div className="mx_MPollBody">
-            <h2>{ poll.question.text }</h2>
+            <h2>{ poll.question.text }{ editedSpan }</h2>
             <div className="mx_MPollBody_allOptions">
                 {
                     poll.answers.map((answer: PollAnswerSubevent) => {