Fix bug #11857 with messed up display for insanely large hscroll values.

 src/xdisp.c (window_hscroll_limited): New function.
 (pos_visible_p, init_iterator): Use it to avoid overflow of pixel
 coordinates when window's hscroll is set to insanely large
 values.
 src/window.h (struct window) <hscroll, min_hscroll>: Change type to 'int'.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/window.h b/src/window.h
index 10cabed979b..2684713eb6b 100644
--- a/src/window.h
+++ b/src/window.h
@@ -238,11 +238,11 @@ struct window
     int sequence_number;
 
     /* Number of columns display within the window is scrolled to the left.  */
-    ptrdiff_t hscroll;
+    int hscroll;
 
     /* Minimum hscroll for automatic hscrolling.  This is the value
        the user has set, by set-window-hscroll for example.  */
-    ptrdiff_t min_hscroll;
+    int min_hscroll;
 
     /* Displayed buffer's text modification events counter as of last time
        display completed.  */