chat: fix autoGrow

public/assets/chat/chat.coffee

@@ -46,10 +46,9 @@ do($ = window.jQuery, window) ->
 
       @el.find('.zammad-chat-header').click @toggle
       @el.find('.zammad-chat-controls').on 'submit', @onSubmit
-      @el.find('.zammad-chat-input').on(
+      @el.find('.zammad-chat-input').on
         keydown: @checkForEnter
         input: @onInput
-      ).autoGrow { extraLine: false }
 
       @session_id = undefined
 
@@ -126,7 +125,10 @@ do($ = window.jQuery, window) ->
                 console.log 'Zammad Chat: Too many clients in queue. Clients in queue: ', pipe.data.queue
 
     onReady: =>
-      @show() if @options.show
+      if @options.show
+        @show()
+        @el.find('.zammad-chat-input').autoGrow
+          extraLine: false
 
     onInput: =>
       # remove unread-state from messages

public/assets/chat/chat.js

@@ -150,8 +150,6 @@ var bind = function(fn, me){ return function(){ return fn.apply(me, arguments);
       this.el.find('.zammad-chat-input').on({
         keydown: this.checkForEnter,
         input: this.onInput
-      }).autoGrow({
-        extraLine: false
       });
       this.session_id = void 0;
       if (!window.WebSocket) {
@@ -262,7 +260,10 @@ var bind = function(fn, me){ return function(){ return fn.apply(me, arguments);
 
     ZammadChat.prototype.onReady = function() {
       if (this.options.show) {
-        return this.show();
+        this.show();
+        return this.el.find('.zammad-chat-input').autoGrow({
+          extraLine: false
+        });
       }
     };