GNU bug report logs - #47360
27.1; using 'bar cursor, mouseclick is rounded to the wrong char position

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From: Julian Rohrhuber <rohrhuber <at> protonmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Lars Ingebrigtsen <larsi <at> gnus.org>, 47360 <at> debbugs.gnu.org
Subject: bug#47360: 27.1; using 'bar cursor, mouseclick is rounded to the wrong char position
Date: Sun, 28 Mar 2021 13:13:20 +0000

[Message part 1 (text/plain, inline)]

> On 28. Mar 2021, at 15:00, Julian Rohrhuber <rohrhuber <at> protonmail.com> wrote:
>
>> On 28. Mar 2021, at 09:25, Eli Zaretskii <eliz <at> gnu.org> wrote:
>>
>>>
>>> Date: Sun, 28 Mar 2021 07:15:38 +0000
>>> From: Julian Rohrhuber <rohrhuber <at> protonmail.com>
>>> Cc: larsi <at> gnus.org, 47360 <at> debbugs.gnu.org
>>>
>>>
>>>>> There is one more case where one can feel the difference: when selecting with the mouse and dragging to the right, the selection jumps to each character a little "too late", that is, after you have already crossed the position you want the selection to end at. You have to point to a character *after* the one you want to include. The current selection always is up to one character behind the cursor barline.  This results in a "sticky" feeling.
>>>>
>>>> Yes, selection in Emacs works on per-character granularity, because it
>>>> uses the faces infrastructure.  We'd need to do something very
>>>> different to make that use pixel granularity.  Patches are welcome.
>>>
>>> I don't think that a change of granularity would be necessarily at all to improve what I describe. All what would have to be done is to change at what *cursor* position the selection jumps to the next character (namely when it crosses its middle). So it would only another application of the solution to the current issue.
>>
>> Sorry, I thought you were talking about the jumps, not about when the
>> jump is done.
>>
>> However, with your proposal, the jump will be too early, so instead of
>> "lagging" the selection would sometimes "lead" the mouse pointer,
>> i.e. be ahead of it.  As long as the changes are one character at a
>> time, there's no way around that basic fact.
>
> Yes, it will still be off -- but only half as far. This makes a big difference in terms of interaction.
> Checking other editors, they do it the same, and I think that is what is the "expected behaviour".

here are screen recordings for both (each with emacs and atom), I hope they show the issue better than I can do with words:

[cursor-rounding-emacs.mov (video/quicktime, attachment)]

[cursor-rounding-atom.mov (video/quicktime, attachment)]

[selection-rounding-emacs.mov (video/quicktime, attachment)]

[selection-rounding-atom.mov (video/quicktime, attachment)]

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