Improved merge dialog (increased width and prevent submit bubbling).

app/assets/javascripts/app/controllers/_application_controller.coffee

@@ -813,6 +813,7 @@ class App.ControllerModal extends App.Controller
     @onCancel(e)
 
   submit: (e) =>
+    e.stopPropagation()
     e.preventDefault()
     @onSubmit(e)
 

app/assets/javascripts/app/controllers/agent_ticket_merge.coffee

@@ -3,6 +3,7 @@ class App.TicketMerge extends App.ControllerModal
   buttonCancel: true
   buttonSubmit: true
   head: 'Merge'
+  large: true
   shown: false
 
   constructor: ->
@@ -56,11 +57,16 @@ class App.TicketMerge extends App.ControllerModal
     @formDisable(e)
     params = @formParam(e.target)
 
+    if !params.master_ticket_number
+      alert(App.i18n.translateInline('%s required!', 'Ticket#'))
+      @formEnable(e)
+      return
+
     # merge tickets
     @ajax(
       id:    'ticket_merge'
       type:  'GET'
-      url:   "#{@apiPath}/ticket_merge/#{@ticket.id}/#{params['master_ticket_number']}"
+      url:   "#{@apiPath}/ticket_merge/#{@ticket.id}/#{params.master_ticket_number}"
       processData: true,
       success: (data, status, xhr) =>