Use ptrdiff_t for composition IDs.

* character.c (lisp_string_width):
* composite.c (composition_table_size, n_compositions)
(get_composition_id, composition_gstring_from_id):
* dispextern.h (struct glyph_string.cmp_id, struct composition_it.id):
* xdisp.c (BUILD_COMPOSITE_GLYPH_STRING):
* window.c (Frecenter):
Use ptrdiff_t, not int, for composition IDs.
* composite.c (get_composition_id): Check for integer overflow.
* composite.h: Adjust prototypes to match the above changes.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/window.c b/src/window.c
index 3f5a743f5c6..04fea6b9bf6 100644
--- a/src/window.c
+++ b/src/window.c
@@ -5069,7 +5069,7 @@ and redisplay normally--don't erase and redraw the frame.  */)
           && (!EQ (Vrecenter_redisplay, Qtty)
               || !NILP (Ftty_type (selected_frame))))
         {
-          int i;
+          ptrdiff_t i;
 
           /* Invalidate pixel data calculated for all compositions.  */
           for (i = 0; i < n_compositions; i++)