Diff your .spacemacs after upgrades

When you upgrade Spacemacs, keep your dotfile in sync by using ediff-dotfile-and-template (SPC f e D). This will enter an ediff session with the .spacemacs template and your personal .spacemacs. Use n and p to move between regions and a/b to copy changes from the template to your .spacemacs. When you’re done, quit and save the changes with q.

Tip from Brian Hicks. Thanks!

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