PLT-1909 Removed the ability to edit system posts (#3013)

* Removed the ability to edit system posts

* Added increased timeout to SpinnerButton unit tests

webapp/components/post_info.jsx

@@ -33,6 +33,7 @@ export default class PostInfo extends React.Component {
         var post = this.props.post;
         var isOwner = this.props.currentUser.id === post.user_id;
         var isAdmin = TeamStore.isTeamAdminForCurrentTeam() || UserStore.isSystemAdminForCurrentUser();
+        const isSystemMessage = post.type.startsWith(Constants.SYSTEM_MESSAGE_PREFIX);
 
         if (post.state === Constants.POST_FAILED || post.state === Constants.POST_LOADING || Utils.isPostEphemeral(post)) {
             return '';
@@ -108,7 +109,7 @@ export default class PostInfo extends React.Component {
             );
         }
 
-        if (isOwner) {
+        if (isOwner && !isSystemMessage) {
             dropdownContents.push(
                 <li
                     key='editPost'

webapp/components/rhs_comment.jsx

@@ -85,6 +85,7 @@ export default class RhsComment extends React.Component {
 
         const isOwner = this.props.currentUser.id === post.user_id;
         var isAdmin = TeamStore.isTeamAdminForCurrentTeam() || UserStore.isSystemAdminForCurrentUser();
+        const isSystemMessage = post.type.startsWith(Constants.SYSTEM_MESSAGE_PREFIX);
 
         var dropdownContents = [];
 
@@ -107,7 +108,7 @@ export default class RhsComment extends React.Component {
             );
         }
 
-        if (isOwner) {
+        if (isOwner && !isSystemMessage) {
             dropdownContents.push(
                 <li
                     role='presentation'

webapp/components/rhs_root_post.jsx

@@ -41,6 +41,7 @@ export default class RhsRootPost extends React.Component {
         const user = this.props.user;
         var isOwner = this.props.currentUser.id === post.user_id;
         var isAdmin = TeamStore.isTeamAdminForCurrentTeam() || UserStore.isSystemAdminForCurrentUser();
+        const isSystemMessage = post.type.startsWith(Constants.SYSTEM_MESSAGE_PREFIX);
         var timestamp = UserStore.getProfile(post.user_id).update_at;
         var channel = ChannelStore.get(post.channel_id);
 
@@ -94,7 +95,7 @@ export default class RhsRootPost extends React.Component {
             );
         }
 
-        if (isOwner) {
+        if (isOwner && !isSystemMessage) {
             dropdownContents.push(
                 <li
                     key='rhs-root-edit'

webapp/tests/spinner_button.test.jsx

@@ -6,6 +6,7 @@ import SpinnerButton from '../components/spinner_button.jsx';
 import React from 'react';
 
 describe('SpinnerButton', function() {
+    this.timeout(10000);
     jsdom();
 
     it('check props', function() {