Re: layer disappears when showframe is set

[Wolfgang Schuster via ntg-context <ntg-context@ntg.nl>]

juh via ntg-context schrieb am 26.08.2021 um 14:46:
> Hi,
>
> this sample shows that the image in a layer in header disappears if showframe is
> set.
>
> \setupexternalfigures[location=default]
> \definelayer[Cow]
> [x=0, y=0]
>
> \setlayer[Cow]
> [x=10em, y=0mm]
> {\externalfigure[cow][height=\lineheight]}
> \setupbackgrounds[header][background=Cow]
>
> \showframe
>
> \starttext
> \input knuth
> \stoptext

The \showframe command is just a wrapper for \setupbackgrounds to enable 
the frames on certain parts of the page.

One of the settings which are passed to \setupbacgrounds when you use 
\showframe is "background=" which resets all previous values of the 
background-key.

To keep the layer setting you have to move \showframe above your own 
\setupbackgrounds command because the reset of the background-key 
happens then before you pass your own value.

Wolfgang

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