- `\pgfversiondatetime` and `\pgfrevisiondatetime` have been removed.
`\pgfversiondate` and `\pgfrevisiondate` now use the format `YYYY-MM-DD`.
`\pgfrevision{,date}` and `\pgfversion{,date}` are synonyms for now, but the
revision should eventually gain back its original meaning. However, as of now
this is not supported by l3build.
- Many operations in `pgfkeys` used to use `\csname` directly which lets the
given csname become `\relax` in case it wasn't defined. This resulted in some
leakage of accidentally `\relax`ed keys into the global scope. This has been
cleaned up a little. To preserve compatibility macros that used to expand to a
`\relax`ed csname now expand to a primitive `\relax`. This affects the
user-level commands `\pgfkeysgetvalue` and `\pgfkeysgetvalueof`. For the
former the change should not be visible except for the number of expansions
required. For `\pgfkeysgetvalueof`, however, the behavior is manifestly
different in that it will now expand to an alias for the primitive `\relax` in
case the value is undefined instead of a `\relax`ed csname. It has always been
semantically wrong to assign to the result of `\pgfkeysgetvalueof`, but now it
will have undesired side-effects. Therefore this change is breaking.
- The `textures` and `vtex` drivers have been deprecated. Both engines are no
longer in active development and lack eTeX features which are required for
quite some time in PGF.
- The file `pgfutil-common-lists.tex` is deprecated and therefore no longer
`\input` by `pgfutil-common.tex`. The macros from this file are specifically
meant for pgfplots and are not used in PGF at all.
### Added
- l3build support for packaging PGF/TikZ
- Add Matrix chat to README
- Add rhombic polihedra #1022
- Add Developer Certificate of Origin (DCO) to Pull Request template and enforce
- Add test set for `graphdrawing` (gd)
- pgfkeys gained support for loading libraries
- Add dependabot to keep GitHub Actions up to date
526e1fd793