Fix cursor movement by 'next-logical-line' after 'next-line'

* src/indent.c (Fvertical_motion): Adjust TO_X when line-numbers
are being displayed.  Remove unneeded "correction" of TO_X at the
goal line.

* lisp/simple.el (last--line-number-width): Remove unneeded
variable.
(line-move-visual): Account for line-number display width by
adjusting the pixel X coordinate that gets converted into
canonical columns passed to vertical-motion, instead of adjusting
temporary-goal-column (which then affects next commands, including
next-logical-line).  (Bug#31723)

2 files changed, 7 insertions, 25 deletions

diff --git a/lisp/simple.el b/lisp/simple.el
index bcf2b067704..cbad75193a4 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -5972,10 +5972,6 @@ columns by which window is scrolled from left margin.
 When the `track-eol' feature is doing its job, the value is
 `most-positive-fixnum'.")
 
-(defvar last--line-number-width 0
-  "Last value of width used for displaying line numbers.
-Used internally by `line-move-visual'.")
-
 (defcustom line-move-ignore-invisible t
   "Non-nil means commands that move by lines ignore invisible newlines.
 When this option is non-nil, \\[next-line], \\[previous-line], \\[move-end-of-line], and \\[move-beginning-of-line] behave
@@ -6254,19 +6250,9 @@ If NOERROR, don't signal an error if we can't move that many lines."
 	     (memq last-command `(next-line previous-line ,this-command)))
 	;; If so, there's no need to reset `temporary-goal-column',
 	;; but we may need to hscroll.
-        (progn
-          (if (or (/= (cdr temporary-goal-column) hscroll)
-                  (>  (cdr temporary-goal-column) 0))
-              (setq target-hscroll (cdr temporary-goal-column)))
-          ;; Update the COLUMN part of temporary-goal-column if the
-          ;; line-number display changed its width since the last
-          ;; time.
-          (setq temporary-goal-column
-                (cons (+ (car temporary-goal-column)
-                         (/ (float (- lnum-width last--line-number-width))
-                            (frame-char-width)))
-                      (cdr temporary-goal-column)))
-          (setq last--line-number-width lnum-width))
+        (if (or (/= (cdr temporary-goal-column) hscroll)
+                (>  (cdr temporary-goal-column) 0))
+            (setq target-hscroll (cdr temporary-goal-column)))
       ;; Otherwise, we should reset `temporary-goal-column'.
       (let ((posn (posn-at-point))
 	    x-pos)
@@ -6276,7 +6262,7 @@ If NOERROR, don't signal an error if we can't move that many lines."
 	 ((memq (nth 1 posn) '(right-fringe left-fringe))
 	  (setq temporary-goal-column (cons (window-width) hscroll)))
 	 ((car (posn-x-y posn))
-	  (setq x-pos (car (posn-x-y posn)))
+	  (setq x-pos (- (car (posn-x-y posn)) lnum-width))
 	  ;; In R2L lines, the X pixel coordinate is measured from the
 	  ;; left edge of the window, but columns are still counted
 	  ;; from the logical-order beginning of the line, i.e. from
diff --git a/src/indent.c b/src/indent.c
index 316171e609b..bcffa0d11e5 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -2278,7 +2278,9 @@ whether or not it is currently displayed in some window.  */)
 	  overshoot_handled = 1;
 	}
       if (lcols_given)
-	to_x = window_column_x (w, window, extract_float (lcols), lcols);
+	to_x =
+	  window_column_x (w, window, extract_float (lcols), lcols)
+	  + lnum_pixel_width;
       if (nlines <= 0)
 	{
 	  it.vpos = vpos_init;
@@ -2330,12 +2332,6 @@ whether or not it is currently displayed in some window.  */)
 	 an addition to the hscroll amount.  */
       if (lcols_given)
 	{
-	  /* If we are displaying line numbers, we could cross the
-	     line where the width of the line-number display changes,
-	     in which case we need to fix up the pixel coordinate
-	     accordingly.  */
-	  if (lnum_pixel_width > 0)
-	    to_x += it.lnum_pixel_width - lnum_pixel_width;
 	  move_it_in_display_line (&it, ZV, first_x + to_x, MOVE_TO_X);
 	  /* If we find ourselves in the middle of an overlay string
 	     which includes a newline after current string position,