Jeff King [off-list ref] writes:
This is an artifact of the way the ANSI colorizing works. Git says "turn
on bold white and a blue background", then it outputs some content, then
it says "turn on green", and so forth. At the end we issue a "reset" to
turn everything back to normal. We should perhaps issue a reset before
outputting the decoration, as we are moving from one colorized bit to
the other, and we don't know what we are inheriting.
Yeah, I agree with the diagnosis and the proposed solution. It sounds
both simple and correct thing to do.