histedit: use "getcommiteditor()" instead of explicit editor choice for "fold"
This patch doesn't change any tests like as preceding patches, because
editor invocation is already tested in "test-histedit-fold.t".
#if test-repo
$ check_code="$TESTDIR"/../contrib/check-code.py
$ cd "$TESTDIR"/..
New errors are not allowed. Warnings are strongly discouraged.
(The writing "no-che?k-code" is for not skipping this file when checking.)
$ hg locate | sed 's-\\-/-g' |
> xargs "$check_code" --warnings --per-file=0 || false
Skipping hgext/zeroconf/Zeroconf.py it has no-che?k-code (glob)
Skipping i18n/polib.py it has no-che?k-code (glob)
Skipping mercurial/httpclient/__init__.py it has no-che?k-code (glob)
Skipping mercurial/httpclient/_readers.py it has no-che?k-code (glob)
Skipping mercurial/httpclient/socketutil.py it has no-che?k-code (glob)
#endif