[racket-dev] [plt] Push #25660: master branch updated

Somewhat small change.  But it was low-hanging fruit, and I needed to make
some kind of progress.  :)

I'll look into the stress tests and will try to add an appropriate one for
the xexpr displaying function.


The place where Scribble documentation generation uses a lot of time
appears to be the evaluations that feed @interactions.  (I have some ideas
on pushing the computation for @interactions off to compile-time, but
haven't cooked and taste-tested the ideas yet.)


There's a surprising amount of time spent turning the part/element
structure into the xexprs (about 9 seconds), and I was going to look into
that next.
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