Fix hi-lock test and add new test for case-fold (bug#40337)

* lisp/hi-lock.el (hi-lock--regexps-at-point): Handle font-lock faces.
(hi-lock-unface-buffer): Simplify default value handling.
(hi-lock-set-pattern): Add either lighter or regexp to
hi-lock-interactive-lighters.
(hi-lock-set-pattern): Put overlay prop hi-lock-overlay-regexp to
either lighter or regexp.

* test/lisp/hi-lock-tests.el (hi-lock-bug26666): Use "b" instead of "a".
(hi-lock-case-fold): New test.

1 files changed, 1 insertions, 1 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 28c01d71f18..7a7f11f5071 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -267,7 +267,7 @@ to substitute spaces in regexp search.
 
 ---
 *** The default value of 'hi-lock-highlight-range' was enlarged.
-The new default value is 2000000 (2 million).
+The new default value is 2000000 (2 megabytes).
 
 ** Texinfo