[texinfo.tex version 2022-09-15.17]
I noticed that for unknown reasons the space width between 'Chapter X:' and the following text in the header line varies; see attached images. Unfortunately, I can't see any logic behind it, which makes it hard for me to provide a minimum example. This seems to be an older bug; I've tested with version 2022-04-10.11, and I get the same issue – apparently, spacing changes (for whatever reason) in the textblock leak into the header line. It might also manifest because we use some extra code to replace CM typewriter with LMMonoLt10 – for the LilyPond documentation we need both a bold and a bold slanted typewriter face to have proper pygments support within LilyPond code snippets. https://gitlab.com/lilypond/lilypond/-/blob/master/Documentation/en/common-macros.itexi#L634 And yes, I walked the extra mile to set up OT1 encoding for these fonts :-) https://gitlab.com/lilypond/lilypond/-/blob/master/Documentation/tex/lm-ot1-map.tex https://gitlab.com/lilypond/lilypond/-/blob/master/Documentation/tex/lm-ot1.tex I hope this helps you find the problem; otherwise please tell me what I should provide next. Werner
