>> (the user could choose whether to not edit the editor,
quoted text
>> or whether to use a no-op for GIT_EDITOR).

Right now, doing

pick a
squash b

will always invoke the editor.  It could be possible to have two 
operation modes.  One in which the sanity check fails, one in which the 
automatic concatenation of two commit messages is used.

quoted text
> Do you think it's useful to add something like --reference (or -C,
> or however it is called) to git-merge?

Maybe it's not useful, but I think it's cleaner than adding the option 
only to git-sequencer.

Paolo

ps: sure you should ask "the others" (who are more knowledgeable than me 
BTW) for opinions about what I proposed.
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