Support mode aliases in 'provided-mode-derived-p'

* lisp/subr.el (provided-mode-derived-p): Check aliases of
MODES as well as MODES themselves.  (Bug#32795)

* test/lisp/subr-tests.el (provided-mode-derived-p): New test.

Copyright-paperwork-exempt: yes

1 files changed, 5 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index e6508eb60bb..354072fc814 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -982,6 +982,11 @@ This works like 'dolist', but reports progress similar to
 This works like 'delete-frame-functions', but runs after the frame to
 be deleted has been made dead and removed from the frame list.
 
+---
+** The function 'provided-mode-derived-p' was extended to support aliases.
+The function now returns non-nil when the argument MODE is derived
+from any alias of any of MODES.
+
 +++
 ** New frame focus state inspection interface.
 The hooks 'focus-in-hook' and 'focus-out-hook' are now obsolete.