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bug#20168: 25.0.50; (elisp) `Accessing Mouse', for `posn-object-x-y'
From: |
Drew Adams |
Subject: |
bug#20168: 25.0.50; (elisp) `Accessing Mouse', for `posn-object-x-y' |
Date: |
Sun, 22 Mar 2015 11:47:28 -0700 (PDT) |
> > The doc string is OK. The manual is misleading/incorrect, in this
> > regard: it speaks about a case where "the POSITION is a buffer
> > position". This is wrong, as a buffer position in Emacs means a natural
> > number 1,2... (or a marker).
>
> Why is it wrong?
It is wrong to say that the value is a buffer position, because a
buffer position is a number, not a position object (which is a cons).
> > Maybe what should be said in this case is
> > that "POSITION represents a buffer position". Its value cannot be
> > simply a buffer position, which is a number or a marker.
>
> Why not? And what's the difference between the current text and your
> suggestion?
The difference is the difference between "is" and "represents".
The value *is* not a buffer position (which is a number). It *is*
a position object (which is a cons). It represents a buffer position
in this case.
It's a minor point, but it was enough to confuse me into trying
to pass an actual buffer position. Nothing in the current
description says that POSITION must be a position object (i.e.,
something for which `posnp' returns non-nil).