Direct messages do not support thread

Author: zcbenz

lib/view/chat-box.js

@@ -337,7 +337,7 @@ handlebars.registerHelper('isChannel', function(messageList, options) {
 })
 
 handlebars.registerHelper('canStartThread', function(messageList, message, options) {
-  if (messageList.type !== 'thread' && (!message.threadId || message.isThreadParent))
+  if (messageList.type === 'channel' && (!message.threadId || message.isThreadParent))
     return options.fn(this)
   else
     return options.inverse(this)