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Re: info: prev-line and scroll-backward are buggy on gnuplot.info


From: Eli Zaretskii
Subject: Re: info: prev-line and scroll-backward are buggy on gnuplot.info
Date: Sat, 12 Nov 2022 14:00:25 +0200

> Date: Sat, 12 Nov 2022 12:40:11 +0100
> From: Vincent Lefevre <vincent@vinc17.net>
> 
> > > Oops, I misread the file. I actually think that it is correct.
> > > IMHO, to get the tree structure, you should not follow the menu,
> > > but only the "File:" lines.
> > 
> > You can't: SPC and DEL are supposed to traverse the tree, not just the
> > current level of the tree.  SPC does depth-first search, and DEL does
> > its opposite.  The File: lines only tell us the nodes that are to the
> > left, to the right, and up, but not down.
> 
> But "down" is the reverse of "up".

No, it isn't.  It is only the reverse of "up" if the node structure is
a perfect tree.  But Texinfo doesn't require such a structure, and in
fact info.info is a notable example of a valid Info file whose node
structure is not a tree (and for a good reason).



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