GNU bug report logs - #39424
auto-scrolling

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Konrad Podczeck <konrad.podczeck <at> univie.ac.at>
To: bug-gnu-emacs <at> gnu.org
Subject: auto-scrolling
Date: Tue, 4 Feb 2020 17:05:06 +0100

I observe the following discrepancy between (a) mouse-drag-region and (b) mouse-drag-region-rectangle.

Concerning (a), as soon as one comes with the mouse below the mode-line of the frame, so that auto-scrolling becomes effective, the cursor jumps to the beginning of the line below the region and that line appears as non-selected during further scrolling.

As for (b), as usual with other text editors, if one comes with the mouse below the mode-line of the frame, the cursor stays at the beginning or end of the region, and there is no line which appears non-selected.

I could neither find any explanation for this discrepancy in the manuals, nor a customization option which, for (a), gives the same behavior as in case of (b).

Konrad

Message #8 received at 39424 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Konrad Podczeck <konrad.podczeck <at> univie.ac.at>
Cc: 39424 <at> debbugs.gnu.org
Subject: Re: bug#39424: auto-scrolling
Date: Tue, 04 Feb 2020 20:27:18 +0200

> From: Konrad Podczeck <konrad.podczeck <at> univie.ac.at>
> Date: Tue, 4 Feb 2020 17:05:06 +0100
> 
> I observe the following discrepancy between (a) mouse-drag-region and (b) mouse-drag-region-rectangle.
> 
> Concerning (a), as soon as one comes with the mouse below the mode-line of the frame, so that auto-scrolling becomes effective, the cursor jumps to the beginning of the line below the region and that line appears as non-selected during further scrolling.
> 
> As for (b), as usual with other text editors, if one comes with the mouse below the mode-line of the frame, the cursor stays at the beginning or end of the region, and there is no line which appears non-selected.
> 
> I could neither find any explanation for this discrepancy in the manuals, nor a customization option which, for (a), gives the same behavior as in case of (b).

mouse-drag-region selects whole lines, so it moves the cursor beyond
the end of the last line in the region, to cause the scrolling.

I see no problem in either behavior, and don't really understand why
there should be any consistency between these two.  They do different
things.

Message #11 received at 39424 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattiase <at> acm.org>
To: Eli Zaretskii <eliz <at> gnu.org>,
 Konrad Podczeck <konrad.podczeck <at> univie.ac.at>
Cc: 39424 <at> debbugs.gnu.org
Subject: Re: bug#39424: auto-scrolling
Date: Tue, 4 Feb 2020 21:40:48 +0100

> mouse-drag-region selects whole lines, so it moves the cursor beyond
> the end of the last line in the region, to cause the scrolling.

mouse-drag-region selects characters, words or lines depending on how many clicks were used to initiate the drag.

If I understand Konrad's request correctly, he suggests that the last line be partially selected during autoscrolling, to match the horizontal position of the mouse cursor, at least during single-click-selection -- is that right?
For mouse-drag-region-rectangle this is a clear necessity, but only a minor cosmetic detail for linear selection. That's why nobody bothered to do anything about it until rectangle-selection was added.

Message #14 received at 39424 <at> debbugs.gnu.org (full text, mbox):

From: Konrad Podczeck <konrad.podczeck <at> univie.ac.at>
To: Mattias Engdegård <mattiase <at> acm.org>
Cc: 39424 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: Re: bug#39424: auto-scrolling
Date: Tue, 4 Feb 2020 22:24:44 +0100

> Am 04.02.2020 um 21:40 schrieb Mattias Engdegård <mattiase <at> acm.org>:
> 
>> mouse-drag-region selects whole lines, so it moves the cursor beyond
>> the end of the last line in the region, to cause the scrolling.
> 
> mouse-drag-region selects characters, words or lines depending on how many clicks were used to initiate the drag.
> 
> If I understand Konrad's request correctly, he suggests that the last line be partially selected during autoscrolling, to match the horizontal position of the mouse cursor, at least during single-click-selection -- is that right?

Yes, that’s what I mean.

Thanks,

Konrad

> For mouse-drag-region-rectangle this is a clear necessity, but only a minor cosmetic detail for linear selection. That's why nobody bothered to do anything about it until rectangle-selection was added.
> 

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