patch 8.2.0670: cannot change window when evaluating 'completefunc'

Problem:    Cannot change window when evaluating 'completefunc'.
Solution:   Make a difference between not changing text or buffers and also
            not changing window.
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index ca69c29..65ef936 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -5749,7 +5749,7 @@
 handle_any_postponed_drop(void)
 {
     if (!drop_busy && drop_filev != NULL
-		     && !text_locked() && !curbuf_locked() && !updating_screen)
+	     && !text_locked() && !curbuf_locked() && !updating_screen)
 	handle_drop_internal();
 }
 #endif