Major changes in 3.9.91:
* Use a GtkRevealer for the search bar
* Don't present redundant options for operations on single
  files (William Kunkel)
* Fix desktop window for newer GTK+ client side decorations
  (Christian Hergert, Matthias Clasen)
* Fix double menu when right clicking on the pathbar (Stefano Facchini)
* Fix headerbar appearance with latest GTK+ (Yosef or Boczko)
* Fix copy/cut/paste accels not working correctly