Support the new log-edit behavior in vc-git-log-edit-toggle-amend
* lisp/vc/log-edit.el (log-edit-set-header): Extract from `log-edit-toggle-header'. (log-edit-extract-headers): Separate the summary, when extracted from header, from the rest of the message with an empty line. * lisp/vc/vc-git.el (vc-git-log-edit-toggle-amend): Move the summary line, if present, to the Summary header.
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