Patch to Gray color model is in xcolor v3.00

[muzimuzhi]

Just a reminder.

The current way how hycolor.sty patches Gray color model in xcolor works with both pre-3.00 and at-least-3.00 xcolor versions. So there's no urgent need to adapt hycolor.

Maybe in some future release that patch can be moved to now historic xcolor-patch.sty. And in hycolor.sty use something like

\AddToHook{begindocument}{%
  \IfPackageAtLeastTF{xcolor}{2023-11-11}{\RequirePackage{xcolor-patch}}%
}

• The patch was added to hycolor.sty in commit 54b6343 (include Gray patch, 2020-01-28).
• xcolor applied that patch in commit latex3/xcolor@7b1e72b, a merge commit of merging Change to new key handler latex3/xcolor#30.

[u-fischer]

Well the future plan is to remove hycolor alltogether and to use only l3color. In the pdfmanagement I no longer make use of it by patching xcolor to define also l3color colors. It would help if tikz could review its uses of color internals. See e.g. pgf-tikz/pgf#1244 and https://tex.stackexchange.com/a/701298/2388 ;-)