magit-with-editor-envvar: New variable
Setting this to `GIT_SEQUENCE_EDITOR' means that Emacs will be used to edit a file on behalf of `git rebase -i' but not when creating commits. In that case `GIT_EDITOR' (if set, else `EDITOR') will be used to edit commit messages and similar files. Setting one of these env variables is the responsibility of the user; by setting this variable, they have opted out of having Magit do it for them. Closes #3629.
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