misc/52344: editline ^W mis-behaviour?

[bch <brad.harder%gmail.com@localhost>]

>Number:         52344
>Category:       misc
>Synopsis:       sh(1) ^W (editline ^W) not working as expected
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    misc-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jun 26 19:45:00 +0000 2017
>Originator:     bch <brad.harder%gmail.com@localhost>
>Release:        NetBSD 8.99.1
>Organization:
	method logic digital
>Environment:
System: NetBSD fremont 8.99.1 NetBSD 8.99.1 (GENERIC) #28: Mon Jun 26
11:13:57 PDT 2017 root@fremont:/usr/obj/sys/arch/amd64/compile/GENERIC
amd64
Architecture: x86_64
Machine: amd64
>Description:
	^W (control-w) appears to be working like ^U, deleting entire line
instead of expected single previous word
>How-To-Repeat:
	type some stuff in NetBSD /bin/sh, with spaces to create word tokens.
Be at EOL, type ^W, witness entire line disappear instead of single
previous word disappearing.
>Fix: