GNU bug report logs - #23419
25.0.93; double-click-time

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Package: emacs; Severity: minor; Reported by: martin rudalics <rudalics@HIDDEN>; dated Mon, 2 May 2016 08:05:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Removed tag(s) patch. Request was from Stefan Kangas <stefan@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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 (message from Stefan Kangas on Fri, 14 Aug 2020 20:49:18 -0700)
Subject: Re: bug#23419: 25.0.93; double-click-time
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> From: Stefan Kangas <stefan@HIDDEN>
> Date: Fri, 14 Aug 2020 20:49:18 -0700
> Cc: 23419 <at> debbugs.gnu.org
> 
> In the attached patch I add a new function `mouse-double-click-time'
> which always returns a number.  This seems better than adding
> specialized logic everywhere to handle the various cases.

I don't see how this resolves the issue pointed out by Martin.  How do
we know that the problematic callers will DTRT with the arbitrary
values your function returns for t and nil?  Using a very large number
for t may be a good approximation (although I'm not even sure in that
case), but using zero for nil?

I'm afraid there's no way around auditing each caller and determining
what those non-numerical values mean in each case.  For example, I'd
actually suggest to avoid the call to sit-for in the nil case, because
a double-click will never be "on the way" in that case.

Thanks.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#23419; Package emacs. Full text available.
bug Marked as found in versions 28.0.50. Request was from Stefan Kangas <stefan@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Added tag(s) patch. Request was from Stefan Kangas <stefan@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#23419: 25.0.93; double-click-time
To: martin rudalics <rudalics@HIDDEN>
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tags 23419 + patch
thanks

martin rudalics <rudalics@HIDDEN> writes:

> The documentation of =E2=80=98double-click-time=E2=80=99 is as:
>
>   Maximum time between mouse clicks to make a double-click.
>   Measured in milliseconds.  The value nil means disable double-click
>   recognition; t means double-clicks have no time limit and are detected
>   by position only.
>
> However, most uses of =E2=80=98double-click-time=E2=80=99 in the lisp dir=
ectory silently
> assume that the value is a number which typically fails in =E2=80=98sit-f=
or=E2=80=99s
> like, for example, in help.el's
>
>   (not (sit-for (/ double-click-time 1000.0) t))
>
> when =E2=80=98double-click-time=E2=80=99 is either t or nil.
>
> Could someone out there who understands the semantics of these
> =E2=80=98sit-for=E2=80=99s please fix them.  I can eventually do that mys=
elf but these
> semantics are yet pretty unclear to me.

I can confirm this.  To reproduce the issue in help.el, use:

0. emacs -Q
1. (setq double-click-time nil)
2. C-h k mouse-1

In the attached patch I add a new function `mouse-double-click-time'
which always returns a number.  This seems better than adding
specialized logic everywhere to handle the various cases.

Any comments?

Best regards,
Stefan Kangas

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--00000000000014a2fb05ace26ced--
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#23419; Package emacs. Full text available.

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Message-ID: <572709CA.5010605@HIDDEN>
Date: Mon, 02 May 2016 10:03:22 +0200
From: martin rudalics <rudalics@HIDDEN>
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To: Bug-Gnu-Emacs <bug-gnu-emacs@HIDDEN>
Subject: 25.0.93; double-click-time
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The documentation of =E2=80=98double-click-time=E2=80=99 is as:

   Maximum time between mouse clicks to make a double-click.
   Measured in milliseconds.  The value nil means disable double-click
   recognition; t means double-clicks have no time limit and are detected=

   by position only.

However, most uses of =E2=80=98double-click-time=E2=80=99 in the lisp dir=
ectory silently
assume that the value is a number which typically fails in =E2=80=98sit-f=
or=E2=80=99s
like, for example, in help.el's

   (not (sit-for (/ double-click-time 1000.0) t))

when =E2=80=98double-click-time=E2=80=99 is either t or nil.

Could someone out there who understands the semantics of these
=E2=80=98sit-for=E2=80=99s please fix them.  I can eventually do that mys=
elf but these
semantics are yet pretty unclear to me.

TIA, martin
Acknowledgement sent to martin rudalics <rudalics@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#23419; Package emacs. Full text available.
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