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And if you do M-q on Lisp source code it automatically reindents it properly. I do this hundreds of times a day. (Or at least I think I do. I think "reindent" and my fingers seem to issue the proper command.)

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In that case aggressive-indent-mode will save you hundreds of keystrokes per day.

I just highlight code and press tab.

does it do something special?

Or put cursor at open or closing paren of form and do M-q. No highlight needed.

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