regression in 9.17 and 9.18

[Jim Diamond]

Starting with 9.17 (and continuing in 9.18), if you have a line that
starts with a tab character (as opposed to actual spaces) and you
select the first word on the line by double-clicking, the tab is also
selected.

To reproduce (assuming your 'lnext' char is Ctrl-V and that you press
the tab key for <tab>, of course):

<prompt> echo "^V<tab>aaa"
        aaa
<prompt>

Now double-click on the "aaa" and note that the selection includes
the tab character.

I'm assuming this is an unintended consequence of the changes for
selection of wide characters, but I guess someone who understands
that part of the code and those changes should make a definitive
comment.

Cheers.
				Jim