Update comments.

2 files changed, 12 insertions, 4 deletions

diff --git a/lisp/simple.el b/lisp/simple.el
index cee04f4a961..2209603d91c 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -3645,10 +3645,14 @@ Outline mode sets this."
         (setq new (point))
 
         ;; Process intangibility within a line.
-        ;; Move to the chosen destination position from above,
-        ;; with intangibility processing enabled.
-
-        ;; Avoid calling point-entered and point-left.
+        ;; With inhibit-point-motion-hooks bound to nil, a call to
+        ;; goto-char moves point past intangible text.
+
+        ;; However, inhibit-point-motion-hooks controls both the
+        ;; intangibility and the point-entered/point-left hooks.  The
+        ;; following hack avoids calling the point-* hooks
+        ;; unnecessarily.  Note that we move *forward* past intangible
+        ;; text when the initial and final points are the same.
         (goto-char new)
         (let ((inhibit-point-motion-hooks nil))
           (goto-char new)
diff --git a/src/intervals.c b/src/intervals.c
index e69ff701387..20c4c191a93 100644
--- a/src/intervals.c
+++ b/src/intervals.c
@@ -2016,6 +2016,10 @@ set_point_both (buffer, charpos, bytepos)
   register INTERVAL to, from, toprev, fromprev;
   int buffer_point;
   int old_position = BUF_PT (buffer);
+  /* This ensures that we move forward past intangible text when the
+     initial position is the same as the destination, in the rare
+     instances where this is important, e.g. in line-move-finish
+     (simple.el).  */
   int backwards = (charpos < old_position ? 1 : 0);
   int have_overlays;
   int original_position;