patch 9.1.1003: [security]: heap-buffer-overflow with visual mode

Problem:  [security]: heap-buffer-overflow with visual mode when
          using :all, causing Vim trying to access beyond end-of-line
          (gandalf)
Solution: Reset visual mode on :all, validate position in gchar_pos()
          and charwise_block_prep()

This fixes CVE-2025-22134

Github Advisory:
https://github.com/vim/vim/security/advisories/GHSA-5rgf-26wj-48v8

Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1003,
 /**/
     1002,
 /**/