The function and meaning of variable \@afterindenttrue

Question

I do not know the function and meaning of variable \@afterindenttrue (see figure below). What will change if I change it to \@afterindentfalse, how can I see its changes? Thank you very much.

enter image description here

\def\@tocrmarg{2em}
\def@dotsep{1} %
\def@dottedtocline#1#2#3#4#5{%
\ifnum #1>\c@tocdepth \else
\vskip \z@ @plus.2\p@
{\leftskip #2\relax \rightskip @tocrmarg \parfillskip -\rightskip
\parindent #2\relax@afterindenttrue
\interlinepenalty@M
\leavevmode
@tempdima #3\relax
\advance\leftskip @tempdima \null\nobreak\hskip -\leftskip
{\csname thu@toc@font\endcsname #4}\nobreak
\leaders\hbox{$\m@th\mkern @dotsep mu\hbox{.}\mkern @dotsep mu$}\hfill
\nobreak{\normalfont \normalcolor #5}%
\par}%
\fi}

I can not see any change when I change the @afterindenttrue with @afterindentfalse, which place does this command control? — Peter Yang, Apr 07 '22 at 15:48
Look up @afterindent in source2e, https://texdoc.org/serve/source2e/0 — daleif, Apr 07 '22 at 15:56
I have seen the definition of @afterindenttrue but I still do not understand which place this command control, I commented this command, but its output is the same, no change at all — Peter Yang, Apr 07 '22 at 16:09
That is why I asked you to search that string, then you can see where it is used. It is an if statement — daleif, Apr 07 '22 at 16:20
it shows nothing at all, only code, can you tell me where it control? thank you! — Peter Yang, Apr 07 '22 at 16:28
It controls (or rather is part of a control) that controls whether a following paragraph is indented or not see the code of the indentfirst package that makes the first paragraph after a section heading be indented — David Carlisle, Apr 07 '22 at 16:55
By the way macros - Where do I find out how a command/environment is defined? - TeX - LaTeX Stack Exchange for later reference — user202729, Apr 07 '22 at 17:32
&& package writing - Where do I start LaTeX programming? - TeX - LaTeX Stack Exchange — user202729, Apr 07 '22 at 17:33
@DavidCarlisle Thank you Prof. Carlisle, I want to know why it does not indent if I replace the orginial code in indentfirst.sty with \let@afterindentfalse@afterindentfalse @afterindenttrue and still set \parindent #2\relax@afterindenttrue?? what is the wrong? The default value of @afterindent is false, am I right? — Peter Yang, Apr 07 '22 at 19:28
@DavidCarlisle in other words, if I delete the statement \let@afterindentfalse@afterindenttrue in your indentfirst.sty file, even if write @afterindenttrue, the first paragraph following the section still does not indent? why? — Peter Yang, Apr 07 '22 at 19:46
sorry the question really doesn't hav an answer \@afterindenttrue just makes \if@afterindent mean \iftrue tha is all it does. If you have some later code that has \if@afterindent then i will take the true branch, if you do no have such code then i will do nothing.. This seems to be an XY Question, raher than ask what one single command taken from thousands of lines of latex source does, perhaps you should ask your real question, say what you wan to do and ask how to do it. — David Carlisle, Apr 07 '22 at 20:24

The function and meaning of variable \@afterindenttrue

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