(try_window_reusing_current_matrix): Fix number of disabled lines.

diff --git a/src/xdisp.c b/src/xdisp.c
index 02e592901586f221b658c45d90916f222562275e..82f24551f19bb7f16e1d53ad4f12d9c754d94a02 100644 (file)
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -13811,7 +13811,7 @@ try_window_reusing_current_matrix (w)
                         nrows_scrolled);
 
          /* Disable lines that must be updated.  */
-         for (i = 0; i < it.vpos; ++i)
+         for (i = 0; i < nrows_scrolled; ++i)
            (start_row + i)->enabled_p = 0;
 
          /* Re-compute Y positions.  */