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When you check in changes, C-x C-q first reads a log entry. It pops up a buffer called `*VC-Log*' for you to enter the log entry. When you are finished, type C-c C-c in the `*VC-Log*' buffer. That is when check-in really happens.
To abort check-in, just don't type C-c C-c in that buffer. You can switch buffers and do other editing. As long as you don't try to check in another file, the entry you were editing remains in the `*VC-Log*' buffer, and you can go back to that buffer at any time to complete the check-in.
If you change several source files for the same reason, it is often convenient to specify the same log entry for many of the files. To do this, use the history of previous log entries. The commands M-n, M-p, M-s and M-r for doing this work just like the minibuffer history commands (except that these versions are used outside the minibuffer).
Each time you check in a file, the log entry buffer is put into VC Log
mode, which involves running two hooks:
vc-log-mode-hook. See section AD.2.3 Hooks.