Keep reaction poppers visible at all times

ts/components/conversation/TimelineItem.tsx

@@ -1,7 +1,7 @@
 // Copyright 2019-2021 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only
 
-import React from 'react';
+import React, { RefObject } from 'react';
 import { omit } from 'lodash';
 
 import { LocalizerType, ThemeType } from '../../types/Util';
@@ -153,6 +153,7 @@ export type TimelineItemType =
   | VerificationNotificationType;
 
 type PropsLocalType = {
+  containerElementRef: RefObject<HTMLElement>;
   conversationId: string;
   item?: TimelineItemType;
   id: string;
@@ -179,6 +180,7 @@ export type PropsType = PropsLocalType &
 export class TimelineItem extends React.PureComponent<PropsType> {
   public render(): JSX.Element | null {
     const {
+      containerElementRef,
       conversationId,
       id,
       isSelected,
@@ -204,6 +206,7 @@ export class TimelineItem extends React.PureComponent<PropsType> {
         <Message
           {...omit(this.props, ['item'])}
           {...item.data}
+          containerElementRef={containerElementRef}
           i18n={i18n}
           theme={theme}
           renderingContext="conversation/TimelineItem"