patch 9.0.1705: cursor position wrong when clicking on an unprintable char

Problem:  cursor position wrong when clicking on an unprintable char
Solution: Don't update prev_ptr when wlv.n_extra is not zero.

closes: #12664

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
diff --git a/src/version.c b/src/version.c
index 888e839..2fee8ee 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1705,
+/**/
     1704,
 /**/
     1703,