In insert_file_contents, always set windows' point markers.

This fixes bug #51776.

* src/fileio.c (restore_window_points): Restore a w->mpoint even when that
marker originally pointed into the unchanged area near BOB or EOB.  This
prevents that window's point being moved a long way from its starting place
due to the removal of the central part of the buffer by insert_file_contents.

1 files changed, 6 insertions, 3 deletions

diff --git a/src/fileio.c b/src/fileio.c
index 3c13d3fe416..a7b1649fae8 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3827,6 +3827,7 @@ restore_window_points (Lisp_Object window_markers, ptrdiff_t inserted,
         Lisp_Object car = XCAR (window_markers);
         Lisp_Object marker = XCAR (car);
         Lisp_Object oldpos = XCDR (car);
+        ptrdiff_t newpos;
         if (MARKERP (marker) && FIXNUMP (oldpos)
             && XFIXNUM (oldpos) > same_at_start
             && XFIXNUM (oldpos) < same_at_end)
@@ -3834,10 +3835,12 @@ restore_window_points (Lisp_Object window_markers, ptrdiff_t inserted,
             ptrdiff_t oldsize = same_at_end - same_at_start;
             ptrdiff_t newsize = inserted;
             double growth = newsize / (double)oldsize;
-            ptrdiff_t newpos
-              = same_at_start + growth * (XFIXNUM (oldpos) - same_at_start);
-            Fset_marker (marker, make_fixnum (newpos), Qnil);
+            newpos = same_at_start
+              + growth * (XFIXNUM (oldpos) - same_at_start);
           }
+        else
+          newpos = XFIXNUM (oldpos);
+        Fset_marker (marker, make_fixnum (newpos), Qnil);
       }
 }