tcolorbox problem in two-sided layout

[Sean Fitzpatrick]

I'm running into a weird LaTeX formatting issue.

I've modified the styling a bit on the tcolorbox for Sage input, as follows:

\newtcblisting{sageinput}{sagestyle, colback=sageblue, enhanced, sharp corners, borderline east={0.5pt}{0pt}{black}, borderline west={0.5pt}{0pt}{black},borderline north={0.5pt}{0pt}{black},before skip=10pt, after skip=0pt,frame hidden,}

This works great in a oneside layout.

But when I switch to twoside for printing, some of the input boxes collapse.

(Only some. Others get cut off a bit.)

I get the following:

This should be:

I can fix the ones that are misbehaving by modifying the sagestyle to use after skip=10pt

instead of after skip=0pt, but that leaves some undesirable empty space at the bottom of other boxes that aren't misbehaving in the same way.

OK, so I can just locally modify the ones that don't look right.

But I remain confused: why should changing from oneside to twoside (and making no other change in the .tex file) cause vertical space to disappear in some tcolorboxes?

[Sean Fitzpatrick]

OK, problem seems to be that LaTeX is trying to fit things into the page, and is pushing the output box up until it overlaps the input box.

Changing after skip=0pt in the sageinput definition to after skip=0.1pt fixes the problem.

I just wish I understood why this is triggered by two page layout!

[Sean Fitzpatrick]

Might be related to twoside using \flushbottom instead of \raggedbottom.

If we want to guarantee equivalent pagination for color and print, maybe \raggedbottom needs to be specified somewhere?

[Rob Beezer]

On 8/9/21 9:18 AM, Sean Fitzpatrick wrote:
> Might be related to twoside using \flushbottom instead of \raggedbottom.

Nice job sleuthing! You'll be the pretext-latex.xsl maintainer before you
know it. ;-)

For the record, concise summary here:
https://www.sascha-frank.com/page-break.html

> If we want to guarantee equivalent pagination for color and print, maybe
> \raggedbottom needs to be specified somewhere?

There is a bit of the page-fitter in me. I enjoy the textblock on a
double-sided page being *identical* when I hold it up to the light. But gross
space and uneven page counts are perhaps a better justification (pun intended).
I suspect it is a simple enough declaration to add in.

Does adding a \raggedbottom fix your problem, with no other changes (like the
after skip)?

Thoughts from other page-fitters?

Rob

[Sean Fitzpatrick]

Yes, adding \raggedbottom is sufficient to clear up a number of differences between one side and two side: the tcolorbox squashing, differences in page breaking, etc.

I understand why we like \flushbottom in print though!

If I wanted to keep that aesthetic, my alternative would be to add a very small after skip to stop boxes from overlapping, and live with differences in page breaking.

(When there are a lot of figures in the margin, those differences are a big pain, because I'd have to do manual adjustments twice!)

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[Rob Beezer]

On 8/9/21 5:38 PM, Sean Fitzpatrick wrote:
> Yes, adding \raggedbottom is sufficient to clear up a number of differences
> between one side and two side: the tcolorbox squashing, differences in page
> breaking, etc.

Ragged bottom, or flush bottom, now you can set your preference and go from
there. See pretext-announce, just now.

(Been on my to-do list for *months*.)

Rob

[Sean Fitzpatrick]

Nice! Thanks. I was planning to do some PreTeXt stuff this week (maintenance, mostly) because it's our fall break.

But now I've got a kid at home sick. Sigh.

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