Fixed issue #3375 - chat-no-jquery.js is dropping click binds/event listener after from web page

public/assets/chat/chat-no-jquery.coffee

@@ -598,10 +598,10 @@ do(window) ->
 
     renderBase: ->
       @el.remove() if @el
-      @options.target.innerHTML += @view('chat')(
+      @options.target.insertAdjacentHTML('beforeend', @view('chat')(
         title: @options.title,
         scrollHint: @options.scrollHint
-      )
+      ))
       @el = @options.target.querySelector('.zammad-chat')
       @input = @el.querySelector('.zammad-chat-input')
       @body = @el.querySelector('.zammad-chat-body')

public/assets/chat/chat-no-jquery.js

@@ -1042,10 +1042,10 @@ var extend = function(child, parent) { for (var key in parent) { if (hasProp.cal
       if (this.el) {
         this.el.remove();
       }
-      this.options.target.innerHTML += this.view('chat')({
+      this.options.target.insertAdjacentHTML('beforeend', this.view('chat')({
         title: this.options.title,
         scrollHint: this.options.scrollHint
-      });
+      }));
       this.el = this.options.target.querySelector('.zammad-chat');
       this.input = this.el.querySelector('.zammad-chat-input');
       this.body = this.el.querySelector('.zammad-chat-body');