Down arrow key skips lines when window too short

Down arrow key skips lines when window too short

[Andrew Pennebaker]

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When I use Emacs in full screen mode, the Down arrow key works just fine
for navigating down a source code buffer. But when the window gets too
short (e.g., C-x 2), then pressing Down begins to skip "paragraphs" of
code, making it hard to edit the desired line.

This behavior occurs for the Down arrow key, `C-n`, and `M-x next-line`, as
well as for the reverse functions Up, `C-l`, and `M-x previous-line`.

Can someone help me modify my `~/.emacs` to prevent these line skips from
happening?

I'm using Homebrew Emacs 24.2.1 on Mac OS X 10.8.2.

-- 
Cheers,

Andrew Pennebaker
www.yellosoft.us

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Re: Down arrow key skips lines when window too short

[Peter Dyballa]

Am 11.03.2013 um 20:31 schrieb Andrew Pennebaker:

> When I use Emacs in full screen mode, the Down arrow key works just fine
> for navigating down a source code buffer. But when the window gets too
> short (e.g., C-x 2), then pressing Down begins to skip "paragraphs" of
> code, making it hard to edit the desired line.
> 
> This behavior occurs for the Down arrow key, `C-n`, and `M-x next-line`, as
> well as for the reverse functions Up, `C-l`, and `M-x previous-line`.

The reason for this is a user-friendly behaviour: near the vertical ends of the buffer performs some jump-scroll to instantly show more of the hidden buffer contents.

I don't know exactly how to cure the effect, maybe setting scroll-margin and scroll-step can adjust the behaviour to your likings.

Making the window higher would also help…

--
Greetings

  Pete

Increase the size of your bike by at least *five* inches!

Re: Down arrow key skips lines when window too short

[Eli Zaretskii]

> From: Peter Dyballa <Peter_Dyballa@Web.DE>
> Date: Tue, 12 Mar 2013 11:04:35 +0100
> Cc: Emacs Help <help-gnu-emacs@gnu.org>
> 
> > When I use Emacs in full screen mode, the Down arrow key works just fine
> > for navigating down a source code buffer. But when the window gets too
> > short (e.g., C-x 2), then pressing Down begins to skip "paragraphs" of
> > code, making it hard to edit the desired line.
> > 
> > This behavior occurs for the Down arrow key, `C-n`, and `M-x next-line`, as
> > well as for the reverse functions Up, `C-l`, and `M-x previous-line`.
> 
> The reason for this is a user-friendly behaviour: near the vertical ends of the buffer performs some jump-scroll to instantly show more of the hidden buffer contents.

But even then it shouldn't move by paragraphs.  So it's either a bug
or some of the OP's customizations request that.

Re: Down arrow key skips lines when window too short

[Peter Dyballa]

Am 12.03.2013 um 17:18 schrieb Eli Zaretskii:

> But even then it shouldn't move by paragraphs.

I assumed the effect was looking like that. Humans can be so inexact…

--
Greetings

  Pete

If you're not confused, you're not paying attention.

Re: Down arrow key skips lines when window too short

[Andrew Pennebaker]

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Yes, I've tried emacs -Q and setq'ing scroll-conservatively to large
integer values.

The behavior remains the same, by which I mean, attempting to move the
cursor one line past the vertical window limit results in the cursor
jumping over the desired line, making edits in short windows difficult.
On Mar 12, 2013 4:01 PM, "Peter Dyballa" <Peter_Dyballa@web.de> wrote:

>
> Am 12.03.2013 um 17:18 schrieb Eli Zaretskii:
>
> > But even then it shouldn't move by paragraphs.
>
> I assumed the effect was looking like that. Humans can be so inexact…
>
> --
> Greetings
>
>   Pete
>
> If you're not confused, you're not paying attention.
>
>
>

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Re: Down arrow key skips lines when window too short

[Andrew Pennebaker]

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Update: This behavior also occurs in Emacs for Mac OS X, 24.3.


On Tue, Mar 12, 2013 at 4:14 PM, Andrew Pennebaker <
andrew.pennebaker@gmail.com> wrote:

> Yes, I've tried emacs -Q and setq'ing scroll-conservatively to large
> integer values.
>
> The behavior remains the same, by which I mean, attempting to move the
> cursor one line past the vertical window limit results in the cursor
> jumping over the desired line, making edits in short windows difficult.
> On Mar 12, 2013 4:01 PM, "Peter Dyballa" <Peter_Dyballa@web.de> wrote:
>
>>
>> Am 12.03.2013 um 17:18 schrieb Eli Zaretskii:
>>
>> > But even then it shouldn't move by paragraphs.
>>
>> I assumed the effect was looking like that. Humans can be so inexact…
>>
>> --
>> Greetings
>>
>>   Pete
>>
>> If you're not confused, you're not paying attention.
>>
>>
>>


-- 
Cheers,

Andrew Pennebaker
www.yellosoft.us

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Re: Down arrow key skips lines when window too short

[Damien Wyart]

* Peter Dyballa <Peter_Dyballa@Web.DE> in gnu.emacs.help:
> > When I use Emacs in full screen mode, the Down arrow key works just
> > fine for navigating down a source code buffer. But when the window
> > gets too short (e.g., C-x 2), then pressing Down begins to skip
> > "paragraphs" of code, making it hard to edit the desired line.

> The reason for this is a user-friendly behaviour: near the vertical
> ends of the buffer performs some jump-scroll to instantly show more of
> the hidden buffer contents.

> I don't know exactly how to cure the effect, maybe setting
> scroll-margin and scroll-step can adjust the behaviour to your
> likings.

The documentation for scroll-step says :

  If you want scrolling to always be a line at a time, you should set
  `scroll-conservatively' to a large value rather than set this to 1.

According to scroll-conservatively documentation, such a large value
should be more than 100.

-- 
DW

Re: Down arrow key skips lines when window too short

[Eli Zaretskii]

> Date: Mon, 11 Mar 2013 15:31:45 -0400
> From: Andrew Pennebaker <andrew.pennebaker@gmail.com>
> 
> When I use Emacs in full screen mode, the Down arrow key works just fine
> for navigating down a source code buffer. But when the window gets too
> short (e.g., C-x 2), then pressing Down begins to skip "paragraphs" of
> code, making it hard to edit the desired line.
> 
> This behavior occurs for the Down arrow key, `C-n`, and `M-x next-line`, as
> well as for the reverse functions Up, `C-l`, and `M-x previous-line`.
> 
> Can someone help me modify my `~/.emacs` to prevent these line skips from
> happening?
> 
> I'm using Homebrew Emacs 24.2.1 on Mac OS X 10.8.2.

This might or might not be a bug.  Can you try the latest Emacs 24.3,
released just yesterday?  If the problem persists there, come back
here and describe the way of reproducing the problem starting with
"emacs -Q".  Maybe it's a feature, in which case there are some
scroll-* variables whose customization could help you.  Or maybe it's
a bug that wasn't yet fixed.