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bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build
From: |
Stephen Berman |
Subject: |
bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build |
Date: |
Tue, 30 Aug 2022 10:20:06 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
On Tue, 30 Aug 2022 09:25:45 +0800 Po Lu <luangruo@yahoo.com> wrote:
> Stephen Berman <stephen.berman@gmx.net> writes:
>
>> 0. emacs -Q
>> 1. Display a buffer with enough lines to scroll, e.g.:
>> C-x d /path/to/emacs/sources RET
>> 2. Scroll mouse wheel
>> => The buffers fails to scroll.
>> 3. Type `C-h k' and then scroll the mouse wheel
>> => The echo area shows no input, only the prompt "Describe the following
>> key, mouse click, or menu item: "
>>
>> I see this only on the Lucid build. Also on Lucis, if I hold down
>> mouse-1 or mouse-3 and simultaneously scroll the wheel, then the buffer
>> does scroll. After releasing mouse-1 or mouse-3, scrolling the wheel
>> scrolls the buffer once by one line (either up or down). Further
>> scrolling of the wheel fails to scroll the buffer.
>
> To be clear here, you are talking about wheel-up and wheel-down events,
> correct?
Yes.
On Tue, 30 Aug 2022 09:29:34 +0800 Po Lu <luangruo@yahoo.com> wrote:
> Unfortunately, I cannot reproduce the bug on any build of Emacs. Please
> instrument the following code around line 21053 of xterm.c as follows:
>
>
> /* See the comment on top of x_cache_xi_devices
> for more details on how scroll wheel movement
> is reported on XInput 2. */
> delta = x_get_scroll_valuator_delta (dpyinfo, device,
> i, *values, &val);
> values++;
>
> if (!val)
> {
> other_valuators_found = true;
> continue;
> }
>
> printf ("%g\n", delta); <=== add this instrumentation
>
> if (delta != DBL_MAX)
> {
>
> and show what is printed when you try to scroll using the mouse.
1.79769e+308
(This is printed in the shell I invoked emacs -Q from each time I scroll
the mouse wheel up or down.)
Steve Berman
- bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build, Stephen Berman, 2022/08/29
- bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build, Po Lu, 2022/08/29
- bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build, Po Lu, 2022/08/29
- bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build,
Stephen Berman <=
- bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build, Po Lu, 2022/08/30
- bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build, Stephen Berman, 2022/08/30
- bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build, Po Lu, 2022/08/30
- bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build, Stephen Berman, 2022/08/30
- bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build, Po Lu, 2022/08/30
- bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build, Stephen Berman, 2022/08/30
- bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build, Po Lu, 2022/08/30
- bug#57476: 29.0.50; Mouse wheel event ignored on Lucid build, Stephen Berman, 2022/08/31