patch 8.2.3953: insert completion code is too complicated

Problem:    Insert completion code is too complicated.
Solution:   More refactoring.  Move function arguments into a struct.
            (Yegappan Lakshmanan, closes #9437)
diff --git a/src/version.c b/src/version.c
index 5f24ba4..1e955c4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3953,
+/**/
     3952,
 /**/
     3951,