old_contents: import sublime
  import sublime_plugin
  
  
  class QuickFileOpenCommand(sublime_plugin.WindowCommand):
      def run(self):
          settings = sublime.load_settings('QuickFileOpen.sublime-settings')
          files = settings.get('files')
          if type(files) == list:
              self.window.show_quick_panel(files, self.on_done)
          elif files is None:
              self.window.show_quick_panel(['Set the \'files\' setting to use QuickFileOpen'], None)
          else:
              sublime.error_message('The \'files\' setting must be a list')
  
      def on_done(self, selected):
          settings = sublime.load_settings('QuickFileOpen.sublime-settings')
          files = settings.get('files')
          fileName = files[selected]
          self.window.open_file(fileName)
  
new_contents: import sublime
  import sublime_plugin
  
  
  class QuickFileOpenCommand(sublime_plugin.WindowCommand):
      def run(self):
          settings = sublime.load_settings('QuickFileOpen.sublime-settings')
          files = settings.get('files')
          if type(files) == list:
              self.window.show_quick_panel(files, self.on_done)
          elif files is None:
              self.window.show_quick_panel(['Set the \'files\' setting to use QuickFileOpen'], None)
          else:
              sublime.error_message('The \'files\' setting must be a list')
  
      def on_done(self, selected):
          if selected == -1:
              return
  
          settings = sublime.load_settings('QuickFileOpen.sublime-settings')
          files = settings.get('files')
          fileName = files[selected]
          self.window.open_file(fileName)
  
subject: Handle the case where the user exits the panel