Fix bug #9324 with unwarranted repositioning of point.

 src/xdisp.c (redisplay_window): Don't force window start if point
 will be invisible in the resulting window.

lisp/emacs-lisp/cl-loaddefs.el

@@ -282,7 +282,7 @@ Not documented
 ;;;;;;  flet progv psetq do-all-symbols do-symbols dotimes dolist
 ;;;;;;  do* do loop return-from return block etypecase typecase ecase
 ;;;;;;  case load-time-value eval-when destructuring-bind function*
-;;;;;;  defmacro* defun* gentemp gensym) "cl-macs" "cl-macs.el" "0907093f7720996444ededb4edfe8072")
+;;;;;;  defmacro* defun* gentemp gensym) "cl-macs" "cl-macs.el" "cc8cbd8c86e2facbe61986e992e6c508")
 ;;; Generated autoloads from cl-macs.el
 
 (autoload 'gensym "cl-macs" "\

src/ChangeLog

+2011-08-26  Eli Zaretskii  <eliz@gnu.org>
+
+	* xdisp.c (redisplay_window): Don't force window start if point
+	will be invisible in the resulting window.  (Bug#9324)
+
 2011-08-25  Eli Zaretskii  <eliz@gnu.org>
 
 	* xdisp.c (compute_display_string_pos): Return 2 in DISP_PROP when

src/xdisp.c

@@ -15099,6 +15099,7 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
 	       || (XFASTINT (w->last_modified) >= MODIFF
 		   && XFASTINT (w->last_overlay_modified) >= OVERLAY_MODIFF)))
     {
+      int d1, d2, d3, d4, d5, d6;
       /* If first window line is a continuation line, and window start
 	 is inside the modified region, but the first change is before
@@ -15120,7 +15121,14 @@ redisplay_window (Lisp_Object window, int just_this_one_p)
 	     compute_window_start_on_continuation_line.  (See also
 	     bug#197).  */
 	  && XMARKER (w->start)->buffer == current_buffer
-	  && compute_window_start_on_continuation_line (w))
+	  && compute_window_start_on_continuation_line (w)
+	  /* It doesn't make sense to force the window start like we
+	     do at label force_start if it is already known that point
+	     will not be visible in the resulting window, because
+	     doing so will move point from its correct position
+	     instead of scrolling the window to bring point into view.
+	     See bug#9324.  */
+	  && pos_visible_p (w, PT, &d1, &d2, &d3, &d4, &d5, &d6))
 	{
 	  w->force_start = Qt;
 	  SET_TEXT_POS_FROM_MARKER (startp, w->start);