patch 9.0.0910: setting lines in another buffer may not work well

Problem:    Setting lines in another buffer may not work well.
Solution:   Make sure the buffer being changed has a window. (issue #11558)
diff --git a/src/version.c b/src/version.c
index b642be9..e9b0431 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    910,
+/**/
     909,
 /**/
     908,