(use-package ediff
  :config
  (setq diff-switches               "-u"
        ediff-custom-diff-options   "-U3"
        ediff-split-window-function 'split-window-horizontally
        ediff-window-setup-function 'ediff-setup-windows-plain)
  :hook
  (ediff-startup . ediff-toggle-wide-display)
  (ediff-cleanup . ediff-toggle-wide-display)
  (ediff-suspend . ediff-toggle-wide-display))