patch 8.2.4261: accessing invalid memory in a regular expression

Problem:    Accessing invalid memory when a regular expression checks the
            Visual area while matching in a string.
Solution:   Do not try matching the Visual area in a string.
diff --git a/src/version.c b/src/version.c
index f696b30..4946c3e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4261,
+/**/
     4260,
 /**/
     4259,