One of the most annoying dialogs in Xcode is the undo warning dialog you get when attempting to undo after a save. I do this all the time, and I hate the warning. Luckily, there is a user default to turn it off:
defaults write com.apple.Xcode XCShowUndoPastSaveWarning NO
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Thank you, thank you, thank you…
Really.
Ron
Thank you!