Re: 'git commit .' in a subdirectory also commits staged files in other subdirectories

Taylor Blau [off-list ref] writes:

quoted

'git commit .' in one of them attempted to commit all of them, not
only the files in that subdirectory.

This is a very unreasonable behavior, because while being in any
subdirectory 'git commit .' should only affect that subdirectory, and
not files elsewhere.

That isn't right, though I can't reproduce what you describe from your
report. Try this script out:
...

"git commit --include ." would exhibit the behaviour, but that
should not be the default, so I am also puzzled.