ok stsp

If the histedit log message editor exits without saving its buffer, Got threw away log messages of all commits which were folded. Only the last commit message is preserved, which could be something meaningless like "fixup". Instead, preserve the initial editor buffer content as-is. That is not going to be an ideal log message, but doesn't throw away information and stands out visually because the newly created log message will start with a comment like '# log message of folded commit a0ff...' Problem reported by jrick

Also fixed as part of a different patch from jrick ok jrick

Inspired by a different patch from jrick ok jrick

ok stsp

ok millert

"please push it" stsp