Update webhook posts to never show in collapsed view

webapp/components/post.jsx

@@ -188,6 +188,8 @@ export default class Post extends React.Component {
             if (post.props && post.props.from_webhook && global.window.mm_config.EnablePostIconOverride === 'true') {
                 if (post.props.override_icon_url) {
                     src = post.props.override_icon_url;
+                } else {
+                    src = Constants.DEFAULT_WEBHOOK_LOGO;
                 }
             } else if (Utils.isSystemMessage(post)) {
                 src = Constants.SYSTEM_MESSAGE_PROFILE_IMAGE;

webapp/components/posts_view.jsx

@@ -173,24 +173,15 @@ export default class PostsView extends React.Component {
                 const postFromWebhook = Boolean(post.props && post.props.from_webhook);
                 const prevPostFromWebhook = Boolean(prevPost.props && prevPost.props.from_webhook);
                 const prevPostUserId = Utils.isSystemMessage(prevPost) ? '' : prevPost.user_id;
-                let prevWebhookName = '';
-                if (prevPost.props && prevPost.props.override_username) {
-                    prevWebhookName = prevPost.props.override_username;
-                }
-                let curWebhookName = '';
-                if (post.props && post.props.override_username) {
-                    curWebhookName = post.props.override_username;
-                }
 
                 // consider posts from the same user if:
                 //     the previous post was made by the same user as the current post,
                 //     the previous post was made within 5 minutes of the current post,
-                //     the previous post and current post are both from webhooks or both not,
-                //     the previous post and current post have the same webhook usernames
+                //     the current post is not from a webhook
+                //     the previous post is not from a webhook
                 if (prevPostUserId === postUserId &&
                         post.create_at - prevPost.create_at <= 1000 * 60 * 5 &&
-                        postFromWebhook === prevPostFromWebhook &&
-                        prevWebhookName === curWebhookName) {
+                        !postFromWebhook && !prevPostFromWebhook) {
                     sameUser = true;
                 }
 
@@ -213,13 +204,11 @@ export default class PostsView extends React.Component {
                 //     the previous post was made by the same user as the current post,
                 //     the previous post is not a comment,
                 //     the current post is not a comment,
-                //     the previous post and current post are both from webhooks or both not,
-                //     the previous post and current post have the same webhook usernames
+                //     the current post is not from a webhook
                 if (prevPostUserId === postUserId &&
                         !prevPostIsComment &&
                         !postIsComment &&
-                        postFromWebhook === prevPostFromWebhook &&
-                        prevWebhookName === curWebhookName) {
+                        !postFromWebhook) {
                     hideProfilePic = true;
                 }
             }

webapp/components/rhs_root_post.jsx

@@ -217,6 +217,8 @@ export default class RhsRootPost extends React.Component {
         if (post.props && post.props.from_webhook && global.window.mm_config.EnablePostIconOverride === 'true') {
             if (post.props.override_icon_url) {
                 src = post.props.override_icon_url;
+            } else {
+                src = Constants.DEFAULT_WEBHOOK_LOGO;
             }
         } else if (Utils.isSystemMessage(post)) {
             src = Constants.SYSTEM_MESSAGE_PROFILE_IMAGE;