SirColeman via ntg-context schrieb am 13.02.2024 um 22:04:
The first bug is that descriptions interfere with the counters,
resulting in the peculiar behavior demonstrated in the resulting PDF.
Still no bug and there is no need to create your own counter because
enumerations exist which are descriptions with a counter.
Unless I'm mistaken, I think it happens because the head of the
description is evaluated twice, thus incrementing the counter
twice---at least, that's the only explanation for how the number is
incremented by 2 each time. Further, this issue seems to persist
whether we're using macros or writing \incrementcounter directly.
The solution is to either make sure that the head of descriptions is
evaluated only once, or document that text placed as the head of
descriptions is meant to be evaluated twice, if there's a good reason
for doing so. Of course, this silly example of incrementing counters
can be subdued by placing the \incrementcounter directly in the after
option when customizing descriptions. But it demonstrates the issue.
What you're supposed to do here is to increment the counter *before* you
use the counter value.
As you guessed the content of the title is evaluated multiple times to
get the width of the description title, in cases where a counter is
incremented in such a case (very common when you have counters in a
table cell) you use the trialtypesetting mode to increment only once.
I've tried to make the examples given be as varied as possible,
demonstrating the different ways in which descriptions interact with
the counter.
The second bug is that descriptions, or at least that's my intuitive
expectation, shouldn't interfere with the bullets of items. I expect
that the bullet stays where it is, and the description is placed next
to it. But what happens is that the bullet is shifted to the right,
making it overlap with the description's head, which isn't pretty.
Is this even a real world example?
The reason why the bullet points are at the wrong position is that
descriptions and items use the same mechanism to set the text offset on
the left and right sides and when you combine both mechanism the values
are added. In case you you have a document where a descriptions appear
as part of an item I suggest to use a different alternative (e.g.
serried) for the description layout.
Wolfgang
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