Re: add stencil-whiteout-outline function (issue 236480043 by address@hidden)

[Paul Morris]

> On May 28, 2015, at 8:21 AM, address@hidden wrote:
> 
> Paul, I've set the Google Tracker (#4418) to 'needs_work' based on the
> comments here

Thanks James.  I’ve uploaded a second patch set for review.  
https://codereview.appspot.com/236480043/

(git-cl gave me “Incorrect username or password”  I assume this is due to the 
problem mentioned in the other thread with login credentials.  Everything looks 
ok on Reitveld.)

The patch set uses the new whiteout function as the new default.  The previous 
function and markup command are renamed "whiteout-box".  (This puts whiteout 
and whiteout-box next to each other in alphabetical listings, whereas 
"box-whiteout" wouldn’t have.)  

I’ve incorporated Keith’s feedback, both about delaying the stencil formation 
in stencil.scm and about rearranging the order of things in get_print_stencil 
in grob.cc.  In my tests this did fix the color and file size issues.

Question: should the whiteout property be a number rather than a boolean, so 
that it sets the thickness of the white outline (and #0 replaces ##f)?  Or 
should the whiteout property accept either a number or a boolean?  That would 
make it easier for users to simply get the default (0.3) using ##t, or to set 
it to some other amount.  (A convert-ly rule may be needed… maybe in any case 
to change whiteout to whiteout-box? ...or maybe not?)

-Paul