(Fcompare_buffer_substrings): Add QUIT to main loop.

diff --git a/src/editfns.c b/src/editfns.c
index f8edbad..9c118cc 100644 (file)
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -2473,6 +2473,8 @@ determines whether case is significant or ignored.  */)
         characters, not just the bytes.  */
       int c1, c2;
 
+      QUIT;
+
       if (! NILP (bp1->enable_multibyte_characters))
        {
          c1 = BUF_FETCH_MULTIBYTE_CHAR (bp1, i1_byte);