bug#41722: 26.3; mouse-2 does not work well on 7 button mouse

bug#41722: 26.3; mouse-2 does not work well on 7 button mouse

[Jason]

My mouse has the mouse-wheel-right/left-event capability, however due to
the HW design if you try to generate mouse-2 (eg middle click) it nearly
always is preceded by a mouse-6 or mouse-7 event. xev confirms this.

At some point mwheel.el gained support for the
mouse-wheel-right/left-event, and traps it into
mwheel-scroll. mwheel-scroll causes *any* wheel event to disable mouse-2
on a timer (see mwheel-inhibit-click-event-timer).

Thus with my mouse middle click doesn't work in emacs any more. This is
a new regression at some point since emacs 25.2

Since the mwheel left/right scroll is inhibited by default (see
mouse-wheel-tilt-scroll) it should not trigger the inhibit click event
timer unless that function is turned on.

This mouse is a logitech M-U0007

A simple work around is to unbind mouse-6/7 but it was very tricky to
figure all this out.


In GNU Emacs 26.3 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.14)
 of 2020-03-26, modified by Debian built on lcy01-amd64-020
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description:	Ubuntu 20.04 LTS

Recent messages:
Auto-saving...done
Making completion list...
Type C-x 1 to delete the help window.
Auto-saving...
Starting new Ispell process aspell with default dictionary...
Checking spelling of SUPRESSED...
Auto-saving...done
Saving file /home/njgg/dotfiles/emacs/jgg-mcutpaste.el...
Wrote /home/njgg/dotfiles/emacs/jgg-mcutpaste.el
<f2> is undefined

Configured using:
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Important settings:
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Major mode: Emacs-Lisp

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Load-path shadows:
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/usr/share/emacs/site-lisp/elpa/markdown-mode-2.3snapshot210/markdown-mode-pkg hides /usr/share/emacs/site-lisp/elpa-src/markdown-mode-2.3snapshot210/markdown-mode-pkg
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/usr/share/emacs/site-lisp/elpa/treepy-0.1.1/treepy-autoloads hides /usr/share/emacs/site-lisp/elpa-src/treepy-0.1.1/treepy-autoloads
/usr/share/emacs/site-lisp/elpa/treepy-0.1.1/treepy-pkg hides /usr/share/emacs/site-lisp/elpa-src/treepy-0.1.1/treepy-pkg
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/usr/share/emacs/site-lisp/elpa/with-editor-2.6.0/with-editor-autoloads hides /usr/share/emacs/site-lisp/elpa-src/with-editor-2.6.0/with-editor-autoloads
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~/dotfiles/emacs/verilog-mode hides /usr/share/emacs/26.3/lisp/progmodes/verilog-mode
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Features:
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Memory information:
((conses 16 149412 10533)
 (symbols 48 24551 1)
 (miscs 40 99 284)
 (strings 32 43136 1845)
 (string-bytes 1 1150707)
 (vectors 16 19637)
 (vector-slots 8 572978 6496)
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 (intervals 56 1682 213)
 (buffers 992 16))

bug#41722: 26.3; mouse-2 does not work well on 7 button mouse

[Lars Ingebrigtsen]

Jason <jgg@ziepe.ca> writes:

> My mouse has the mouse-wheel-right/left-event capability, however due to
> the HW design if you try to generate mouse-2 (eg middle click) it nearly
> always is preceded by a mouse-6 or mouse-7 event. xev confirms this.
>
> At some point mwheel.el gained support for the
> mouse-wheel-right/left-event, and traps it into
> mwheel-scroll. mwheel-scroll causes *any* wheel event to disable mouse-2
> on a timer (see mwheel-inhibit-click-event-timer).
>
> Thus with my mouse middle click doesn't work in emacs any more. This is
> a new regression at some point since emacs 25.2
>
> Since the mwheel left/right scroll is inhibited by default (see
> mouse-wheel-tilt-scroll) it should not trigger the inhibit click event
> timer unless that function is turned on.
>
> This mouse is a logitech M-U0007
>
> A simple work around is to unbind mouse-6/7 but it was very tricky to
> figure all this out.

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

If I understand the logic surrounding mwheel-inhibit-click-event-timer
(and I may well not), this is basically working as designed, and the
correct solution here is to do what you did -- unbind mouse-6/7.

I'm not sure what we can do on the Emacs side here -- perhaps document
this better?  But I'm not sure were.  Does anybody have an opinion here?

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

bug#41722: 26.3; mouse-2 does not work well on 7 button mouse

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> I'm not sure what we can do on the Emacs side here -- perhaps document
> this better?  But I'm not sure were.  Does anybody have an opinion here?

I've now added a paragraph about this to the "Misc Events" section in
the lispref manual.

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