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Re: "Pager" page-up and -down, why not merge?
From: |
Juanma Barranquero |
Subject: |
Re: "Pager" page-up and -down, why not merge? |
Date: |
Thu, 5 Jun 2008 00:09:12 +0200 |
> In what way is it different from setting scroll-preserve-screen-position?
It preserves the column, too, which is the whole point of pager.el.
> I suggest we reuse temporary-goal-column instead.
>> (defconst pager-keep-column-commands
>> '(pager-row-down pager-row-up row-dn row-up
>> pager-page-down pager-page-up pg-dn pg-up)
>> "Commands which when called without any other intervening command should
>> keep the `pager-temporary-goal-column'")
>
> What are those extra commands?
pager-row-* are scrolling commands, not needed in Emacs (which has
scroll-lock-mode). pg-dn, pg-up, etc. are aliases for pager 1.0
compatibility.
> Since this doesn't doesn't use scroll-up or scroll-down, it's very much
> unclear whether it's going to behave sufficiently well in all cases.
>
> I'm especially uncomfortable with the use of vertical-motion, which
> doesn't actually use the redisplay's code, but some approximation of its
> behavior, (so it doesn't pay attention to images and other things like
> that, for example).
The original pager.el, which I'm using, does not use
`vertical-motion', but `forward-line', `scroll-down' and `scroll-up'.
Please take a look at http://user.it.uu.se/~mic/pager.el
> PS: Here's a patch to window.c which makes
> scroll-preserve-screen-position preserve the column position as well as
> the line position, tho it only applies to GUI frames, not to tty frames
> (which use another piece of code which I haven't bothered to adjust
> accordingly).
That is a great change, please install it!
Juanma