GH-4187 Turn off dot menu for system messages (#4198)

webapp/components/post_view/components/post_info.jsx

@@ -12,6 +12,7 @@ import TeamStore from 'stores/team_store.jsx';
 import UserStore from 'stores/user_store.jsx';
 
 import * as Utils from 'utils/utils.jsx';
+import * as PostUtils from 'utils/post_utils.jsx';
 import Constants from 'utils/constants.jsx';
 import {Tooltip, OverlayTrigger} from 'react-bootstrap';
 
@@ -48,7 +49,7 @@ export default class PostInfo extends React.Component {
         var isAdmin = TeamStore.isTeamAdminForCurrentTeam() || UserStore.isSystemAdminForCurrentUser();
         const isSystemMessage = post.type && post.type.startsWith(Constants.SYSTEM_MESSAGE_PREFIX);
 
-        if (post.state === Constants.POST_FAILED || post.state === Constants.POST_LOADING || Utils.isPostEphemeral(post)) {
+        if (post.state === Constants.POST_FAILED || post.state === Constants.POST_LOADING) {
             return '';
         }
 
@@ -282,7 +283,7 @@ export default class PostInfo extends React.Component {
                     {this.createRemovePostButton()}
                 </li>
             );
-        } else {
+        } else if (!PostUtils.isSystemMessage(post)) {
             options = (
                 <li className='col col__reply'>
                     <div