window.keymap.bindKeys '.editor',
  'meta-Z': 'editor:checkout-head-revision'

window.keymap.bindKeys '.editor',
  'alt-meta-z': 'editor:checkout-head-revision'

Move checkout-head binding to `alt-meta-z` (meta-Z shadows redo)
Move checkout-head binding to `alt-meta-z` (meta-Z shadows redo)

This is my fault since I told Kevin to use this binding. Ooops.