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


From: Gavin Smith
Subject: Re: info: prev-line and scroll-backward are buggy on gnuplot.info
Date: Sat, 12 Nov 2022 11:30:03 +0000

On Sat, Nov 12, 2022 at 11:56:47AM +0100, Vincent Lefevre wrote:
> On 2022-11-12 11:39:41 +0100, Vincent Lefevre wrote:
> > You mean that the menus can affect the structure of the document?
> > This seems a bad and unnecessary idea. Why not just considering
> > the "File:" lines of the info manual to deduce the structure of
> > the document?

You have to give more detail of an alternative algorithm rather than
saying, "just consider the File: lines".  (The word "just" implies
that what you are asking someone to do is easy and simple, which it
may not be.)

> So the predecessor of
> 
> File: gnuplot.info,  Node: Bugs,  Next: Concept_Index,  Prev: Terminal_types, 
>  Up: Top
> 
> should be the last descendent of Terminal_types, which is
> complete_list_of_terminals.

You only get the relation "last descendant" by looking at the menus.

And according to the menu of complete_list_of_terminals, Bugs is a
decendant of complete_list_of_terminals.

As described in backward_move_node_structure in info/session.c,
the process followed is:

 /* Otherwise, go to 'Prev' node and go down the last entry
    in the menus as far as possible. */

which is exactly what has happened here.




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