GNU bug report logs - #1166
23.0.60; Point jumps instead of scrolling in the new line

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: "Lennart Borgman" <lennart.borgman <at> gmail.com>
Cc: 1166 <at> debbugs.gnu.org
Subject: bug#1166: 23.0.60; Point jumps instead of scrolling in the new line
Date: Sun, 02 Feb 2014 16:06:51 -0800

"Lennart Borgman" <lennart.borgman <at> gmail.com> writes:

> On Tue, Oct 14, 2008 at 7:57 PM, Lennart Borgman (gmail)
> <lennart.borgman <at> gmail.com> wrote:
>> I have found a bug where point jumps to a new postion instead of a new
>> line beeing scrolled into the selected window. I am unable to narrow it
>> down, but I can reproduce it (but I am not sure about what makes it
>> happens). Just to get some thoughts I write down what I have seen so far
>> here.
>>
>> The scenario is this:
>> - Point is on the last line in the window.
>> - I press "o" in viper. This opens a line below the current line and
>> puts the point on this line.
>>
>> What I expect to happen is that this new line is scrolled into the
>> window. Sometimes this happens. Sometimes instead point jumps up, maybe
>> 10 lines (I did not count them at all) and the window is not scrolled so
>> the new line is not visible.
>>
>> There are some other ingredients too:
>> - I believe that nxml-mode (or a derivative) must be the major mode.
>> - If I remove nxml-after-change from after-change-functions the bug
>> disappears.
>> - If I try to use edebug it also disappears.
>>
>> Maybe those ingredients also are required, I am not sure since I can't
>> easily reproduce the bug yet:
>> - visual-line-mode.
>>
>> Does anyone have any idea of how to find out what the problem is? In
>> nxml-after-change there is a whole bunch of "save-*" macros. I commented
>> out them all, but the bug still appears. But where is the scrolling done?
>
> It would help if someone could tell me where the scrolling should have
> taken place. To begin with:
>
> - Where in command_loop_1?
> - And then of course a little bit more exact ...

Is this problem still present in Emacs 24?

-- 
(domestic pets only, the antidote for overdose, milk.)
  bloggy blog http://lars.ingebrigtsen.no/

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