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Re: prevent scroll-lock-mode from scrolling?

From: Eli Zaretskii
Subject: Re: prevent scroll-lock-mode from scrolling?
Date: Mon, 20 Jun 2016 17:34:13 +0300

> From: lee <address@hidden>
> Date: Mon, 20 Jun 2016 01:54:02 +0200
> I turn on scroll-lock-mode to keep the point where it is and don't want
> it to move.  Why would I expect it to move nonetheless?

Because some buffer positions would be unreachable otherwise.

> I was assuming that 'point' means the position where letters appear when
> I type, i. e. where the cursor is.

No, point is _buffer_ position where insertion happens.  It isn't a
screen position.

> > That might make sense in some use cases of view-mode (and even then
> > might get in the way), but not in a general-purpose editable buffer,
> > IMO.  It means some buffer positions are unreachable by
> > vertical-motion commands.
> They won't be unreachable because you can always turn off
> scroll-lock-mode and move the cursor around.

Yes, but turning the mode on and off is an annoyance.

> Can you explain to me why the cursor remains at its position /on the
> screen/ while I'm scrolling with scroll-lock-mode enabled all the time
> like it should --- and then suddenly moves when the top or bottom of the
> buffer contents come into view?

See above: Emacs attempts to let you reach the buffer text below the
cursor position.

> Scroll-lock-mode does that to me.

I understand; this just means scroll-lock-mode is not doing what you
want, it's doing something else.  Maybe someone will extend it to do
what you want, or maybe there's already a similar mode that does.

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