fluctuating baseline of header text

["j. van den hoff" <vandenhoff.j@googlemail.com>]

I observe a slight fluctuation of the baseline of text in the page header  
when going from one page to the next.
a minimal example follows:

\setupheader      [style=\smallbodyfont\ss\it]
\setupheadertexts [section]
\setuppagenumbering[location={header,margin}, style=\bfc]
\starttext
\section{Introduction}
bla
\page[yes]
\section{Introduction}
bla
\page[yes]
\section{Introduction}
bla
\page[yes]
\section{Introduction}
bla
\page[yes]
\section{Introduction}
bla
\page[yes]
\section{Introduction}
bla
\page[yes]
\section{Introduction}
bla
\page[yes]
\section{Introduction}
bla
\page[yes]
\section{Introduction}
bla
\page[yes]
\section{Introduction}
bla
\page[yes]
\stoptext

in this example (and with this font) the problem is only occuring when  
toggling between pages 6/7 or 7/8 (at sufficient zoom it's easy to see),
i.e.the header is shifted downward on page 7. in other docs with different  
fonts it happens across multiple pages. my guess would be it has to
do with the digit heights in the different fonts and the fact that the  
page numbers are much larger than the heading, but that's only a guess.

can someone confirm the problem?

thx,joerg




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