patch 9.0.0720: MS-Windows GUI may have pixel dust from antialiasing

Problem:    MS-Windows GUI may have pixel dust from antialiasing.
Solution:   When a character changes also redraw the next one. (issue #8532)
diff --git a/src/version.c b/src/version.c
index fadd4a3..87259de 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    720,
+/**/
     719,
 /**/
     718,