patch 8.2.1046: insufficient tests for src/buffer.c

Problem:    Insufficient tests for src/buffer.c.
Solution:   Add more tests.  Move comments related tests to a separate file.
            (Yegappan Lakshmanan, closes #6325)
diff --git a/src/version.c b/src/version.c
index 49f9ddf..1ee4530 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1046,
+/**/
     1045,
 /**/
     1044,