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)

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    910,
 /**/
     909,
 /**/