updated for version 7.3.854
Problem:    After using backspace in insert mode completion, CTRL-N and CTRL-P
            do not highlight the right entry. (Olivier Teuliere)
Solution:   Set the current item to the shown item after using backspace.
diff --git a/src/edit.c b/src/edit.c
index 74bbd9a..88fd18a 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -3380,6 +3380,9 @@
     if (compl_leader != NULL)
     {
 	ins_compl_new_leader();
+	if (compl_shown_match != NULL)
+	    /* Make sure current match is not a hidden item. */
+	    compl_curr_match = compl_shown_match;
 	return NUL;
     }
     return K_BS;