patch 9.0.1490: the ModeChanged event may be triggered too often

Problem:    The ModeChanged event may be triggered too often.
Solution:   Only trigger ModeChanged when no operator is pending.
            (closes #12298)
diff --git a/src/version.c b/src/version.c
index 5aa2c12..e5a6ada 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1490,
+/**/
     1489,
 /**/
     1488,