After successfully compiled the demo of LX fonts on LuaLaTeX I noticed two issues with \texttt, one on slide 6 and other on slide 12. To investigate further, I decided to use pdfLaTeX to compile the demo with the following command:
latexmk -pdflatex ./LXfonts-demo.tex
Unfortunately, I encountered the same issues when comparing the original PDF and my output.
(Note: I marked the differences with red circles on the right side of the image, with the original PDF from CTAN on the left.)
(Note: I opened these PDFs with Acrobat Reader)
I also tested this on Overleaf with different versions of TeXLive (e.g., 2014, 2018, 2023), but the results were consistently incorrect.
I used pdffonts -f 6 -l 6 ./LXfonts-demo.pdf to confirm that there is a difference in fonts between the two PDFs. Specifically, for slide 6, I found:
name type encoding emb sub uni object ID
------------------------------------ ----------------- ---------------- --- --- --- ---------
LRFRIT+leclq8 Type 1 Builtin yes yes yes 68 0
QHHCYM+lecli8 Type 1 Builtin yes yes yes 139 0
WBXQQS+LMMono10-Italic Type 1 Custom yes yes yes 237 0
LWMIDP+CMSS12 Type 1 Builtin yes yes yes 238 0
While for the original PDF, it was:
name type encoding emb sub uni object ID
------------------------------------ ----------------- ---------------- --- --- --- ---------
FERQHL+leclq8 Type 1 Builtin yes yes no 43 0
QHHCYM+lecli8 Type 1 Builtin yes yes no 106 0
PVXJCL+SFIT0800 Type 1 Custom yes yes no 192 0
LWMIDP+CMSS12 Type 1 Builtin yes yes no 193 0
I reached out to the font author, who confirmed that on his Mac with MacTeX2023, everything works correctly, and he obtained the same PDF as the one on CTAN.
At this point, I'm uncertain about the source of the problem. Could someone else attempt to compile this demo on their computer and share their findings?
P.S. I'm using TeXLive2023 (updated) from tug.org on ArchLinux.
Update
As Enrico suggested I tried TL2012 using historic archive and I got the same PDF that you can find on CTAN. So I also tried with TL2013 but the issues on page 6 and 12 are reappeared. What is the difference between TL2012 e 2013? Maybe packages version?
