On 2/28/2018 5:28 AM, Henri Menke wrote:
Dear list,
I was wondering, why is the text in the main text block offset by .25\exheight
from above (and below)? Also, can you point me to the source line where this
offset is added in shipout because it is not there in \setuplayout. If you
don't know what I mean, see MWE below.
Cheers, Henri
---
\definelayer
[pagebg]
[width=\textwidth,
height=\textheight]
\setupbackgrounds
[text][background=pagebg]
\showframe
\starttext
\setlayer
[pagebg]
[voffset=.25\exheight] % why?
{\vbox{\strut\input lorem\par}}
\input lorem\par
\stoptext
\definelayer
[pagebg]
[width=\textwidth,
height=\textheight]
\setupbackgrounds
[text][background=pagebg]
\showframe
\starttext
\setlayer
[pagebg]
{\vbox{\red\strut\input lorem\par}}
\setlayer
[pagebg]
[voffset=\dimexpr\topskip-\strutht\relax] % why?
{\vbox{\green\strut\input lorem\par}}
\setlayer
[pagebg]
{\vbox{\blue\topskipcorrection\strut\input lorem\par}}
\input lorem\par
\stoptext
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