\definefontalternative breaks font switches in math

[Florian Wobbe <Florian.Wobbe@awi.de>]

Dear typescript experts,

in an earlier Email I reported, that the font switches did not work in math mode. E.g.,

$\bf a=\alpha$
$\bi a=\alpha$

did not display bold math. It turned out that this happens when I invoke \definefontalternative.

Normaly \bf is defined like this:

*\show\bf
> \bf=\protected macro:
->\ifmmode \mathbf \else \normalbf \fi .
<*> \show\bf

After using \definefontalternative it looks different:

*\show\bf
> \bf=\protected macro:
->\setcurrentfontalternative {bf}.
<*> \show\bf

Minimal example:

% \definefontalternative [sb] % <-- uncomment me to break bold math
\starttext
  $\bf 3x^2+7x$
\stoptext

How to avoid this? Thanks for advice,
Florian

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