[tex4ht] [bug #448] Package patching in the document preamble is broken

[Michal Hoftich]

URL:
  <http://puszcza.gnu.org.ua/bugs/?448>

                 Summary: Package patching in the document preamble is broken
                 Project: tex4ht
            Submitted by: michal_h21
            Submitted on: Mon 17 Feb 2020 10:23:48 PM EET
                Category: None
                Priority: 5 - Normal
                Severity: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

I've found that the mechanism we use for package patching in the preamble
(using usepackage.4ht) is broken due to changes in the LaTeX kernel. This
means that document compilation fails when you use Fontspec font selection
commands now, for instance. I've reported this issue on LaTeX issue tracker:

https://github.com/latex3/latex2e/issues/280

The report contains more information and code samples.

It seems that it cannot be fixed, as the change was done due to another bug.
So we will need to find a workaround. Ulrike Fisher suggested to use the
Filehooks package, which seems to work, so I hope that I will be able to come
with a fix soon.




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