[luatex] logging of mathsurround

[David Carlisle]

Given

\mathsurround=12pt
\tracingonline1
\setbox0\hbox{a$x$b}
\showbox0
\end


tex shows the size of the mathsurround :

> \box0=
\hbox(6.94444+0.0)x40.27086
.\tenrm a
.\mathon, surrounded 12.0
.\teni x
.\mathoff, surrounded 12.0
.\tenrm b


luatex did the same until 0.95 but now it does not log the size of the
extra space:

$ luatex msur
This is LuaTeX, Version beta-0.95.0 (TeX Live 2016)
 restricted system commands enabled.
(./msur.tex
> \box0=
\hbox(6.94444+0.0)x40.27086, direction TLT
.\tenrm a
.\mathon
.\teni x
.\mathoff
.\tenrm b

! OK.
l.5 \showbox0


Was this change intentional?

David