gistfile1.py

def run(self, edit):
  urls = []
  selections = self.view.sel()
  for selection in selections:
    urls.append(self.view.substr(selection))

  messages = self.validate_urls(urls)
  self.show_quick_panel(messages, self.view.window())

def show_quick_panel(self, messages, window):
  window.show_quick_panel(messages, None, sublime.MONOSPACE_FONT)