Suggestion: raise an error if \path is used in \pgfextra without \pgfinterruptpath

[user202729]

As in the title.

Disadvantage is that it will incur an additional check i.e. runtime penalty. Advantage is that it will prevent inadvertent errors in the code which can save user/developer's time.

[muzimuzhi]

Or, in a more general way, execute \tikz@uninstallcommands and \tikz@installcommands at the beginning and ending of \pgfextra code, respectively? In this way, \path and other tikz commands used in \pgfextra code would take their definitions outside of tikzpicture.

pgf/tex/generic/pgf/frontendlayer/tikz/tikz.code.tex

Lines 2558 to 2566 in 12f1783

	% Syntax for pgfextra:
	% \pgfextra {normal tex text}
	% \pgfextra normal tex text \endpgfextra
	\def\tikz@extra{\pgfutil@ifnextchar\bgroup\tikz@@extra\relax}%
	\long\def\tikz@@extra#1{#1\tikz@scan@next@command}%
	\let\endpgfextra=\tikz@scan@next@command
	\def\pgfextra{pgfextra}%

Related to

• Suggestion: add mention to \pgfinterruptpath in \pgfextra's documentation #1327

[muzimuzhi]

Or, in a more general way, execute \tikz@uninstallcommands and \tikz@installcommands at the beginning and ending of \pgfextra code, respectively?

Hmm, No. The suggested way would disable (at least make it harder) use of

\pgfextra{\pgfinterruptpath \path ...; \endpgfinterruptpath}

[hmenke]

This would break existing documents, therefore unfortunately rejected.

[user202729]

I think a document that issues \path without \pgfinterruptpath is buggy and should be fixed anyway.

Adding Tikz node in pgfextra triggers double drawing of containing path - TeX - LaTeX Stack Exchange (not exactly the same issue but related)

That said, we can just make it a warning. I see no harm (cf. pgfplots run in stable mode by default, but upgrading pgfplots may make the document issue an extra warning)