patch 9.0.0993: display errors when adding or removing text property type

Problem:    Display errors when adding or removing text property type.
Solution:   Perform a full redraw.  Only use text properties for which the
            type is defined. (closes #11655)
diff --git a/src/version.c b/src/version.c
index e78066e..9fbed7c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    993,
+/**/
     992,
 /**/
     991,