Fix bug #10076 with vertical cursor motion in hscrolled windows.

 lisp/simple.el (line-move): Force movement by logical lines for any
 hscrolled window, not only when auto-hscroll-mode is on.
 (line-move-visual): Update doc string to that effect.

1 files changed, 6 insertions, 8 deletions

diff --git a/lisp/simple.el b/lisp/simple.el
index e70d37588a0..1dc866cf64d 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -4277,8 +4277,8 @@ into account variable-width characters and line continuation.
 If nil, `line-move' moves point by logical lines.
 A non-nil setting of `goal-column' overrides the value of this variable
 and forces movement by logical lines.
-Disabling `auto-hscroll-mode' also overrides forces movement by logical
-lines when the window is horizontally scrolled."
+A window that is  horizontally scrolled also forces movement by logical
+lines."
   :type 'boolean
   :group 'editing-basics
   :version "23.1")
@@ -4358,12 +4358,10 @@ lines when the window is horizontally scrolled."
     (if (and line-move-visual
 	     ;; Display-based column are incompatible with goal-column.
 	     (not goal-column)
-	     ;; When auto-hscroll-mode is turned off and the text in
-	     ;; the window is scrolled to the left, display-based
-	     ;; motion doesn't make sense (because each logical line
-	     ;; occupies exactly one screen line).
-	     (not (and (null auto-hscroll-mode)
-		       (> (window-hscroll) 0))))
+	     ;; When the text in the window is scrolled to the left,
+	     ;; display-based motion doesn't make sense (because each
+	     ;; logical line occupies exactly one screen line).
+	     (not (> (window-hscroll) 0)))
 	(line-move-visual arg noerror)
       (line-move-1 arg noerror to-end))))