Differences in glues between TL2024 and TL2025

[laylafogiel-hash]

This is more out of curiosity, since I don't think the output has changed:

\documentclass{article}

\begin{document}
\showoutput
foo
\vfill\break
\end{document}

compiling with lualatex, why there is a negative glue at the bottom of the page with TL2025? or at least why the LuaTeX reports about it now?

[FrankMittelbach]

The LaTeX output routine backs up by the depth of the last line (up to maxdepth) to achieve a uniform result in cases where there is a bottom float (for example) or something else. Otherwise the distance to that float would depend on whether or not the last line contains characters with a depth. Strangely enough "foo" has a depth even though a small one in the standard fonts. There is some discussion/background on that in ltnews41 on that change (a configurable OR).

[laylafogiel-hash]

Thanks for the reference and the quick reply! This is also a step in the direction of #1416.