; Revert "; * lisp/subr.el (internal--with-narrowing): Simplify"

This reverts commit d9add66161.

Please install on the release branch only changes that fix
incorrect behavior.  Cleanups don't belong here.

lisp/subr.el

@@ -3956,9 +3956,10 @@ detailed description.
 (defun internal--with-narrowing (start end body &optional tag)
   "Helper function for `with-narrowing', which see."
   (save-restriction
-    (narrow-to-region start end)
-    (when tag (narrowing-lock tag))
-    (funcall body)))
+    (progn
+      (narrow-to-region start end)
+      (if tag (narrowing-lock tag))
+      (funcall body))))
 
 (defun find-tag-default-bounds ()
   "Determine the boundaries of the default tag, based on text at point.