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bug#6256: 24.0.50; read-event in `repeat' command

From: Stefan Monnier
Subject: bug#6256: 24.0.50; read-event in `repeat' command
Date: Mon, 18 Oct 2010 21:13:19 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

>> But that doesn't work either in my tests: the problem is that the
>> last-command-event was `mouse-4' (i.e. the up event) whereas 
>> read-event returns `down-mouse-4' (a subsequent read-event would
>> return the `mouse-4').

> No doubt that is a difference between Emacs on Windows and Emacs on GNU.

> BTW, the behavior you describe doesn't really seem very right for
> a mouse wheel: Why should the first wheel event be `down-'?

Under X11, wheel-up and wheel-down events are buttons, so they get
pressed&released like any other (actually, it seems to be the case for
the hardware as well, so it's not a complete invention of the X11
layer).  I.e. when you turn up the wheel by 3 steps, you get 6 events.

> I would think that `down-' would only be called for when you press the
> mouse wheel (as in mouse-2 clicking using the wheel).  Whatever.

You also get such a down in that case, but that's a down-mouse-2 rather
than a down-mouse-4 or down-mouse-5: pressing on the wheel is
a completely different button from "turning the wheel".

> Seems like the Emacs mouse-wheel behavior on Windows (the events) is
> generally superior to that on GNU.

Yes, tho it's mostly not Emacs's fault.  X11's handling of wheels is
not great.

> What about fixing the latter so that it comes up to speed?
> Another problem is that it precludes having `mouse-4' and `mouse-5'
> correspond to actual mouse buttons.

That's a general problem under X11, yes.  There are various ways to work
around the problem, but it's a source of annoyances.  Typically, the
additional buttons will then appear not as mouse-4/5 but for example as

>> For my case, replacing the read-event by `read-key' happens to make
>> it work (see patch below).  Please confirm whether or not it fixes it
>> for you, and if it doesn't, please show me the values of
>> `repeat-repeat-char' and `evt' in the above test.
>> +        (while (let ((evt (read-key)))
>> ;; For clicks, we need to strip the meta-data to
>> ;; check the underlying event name.
>> (eq (or (car-safe evt) evt)

> Yes, that works for me too.  Please install it if you see no problems
> with it.  Thx.

Thanks, it's installed in emacs-23, closed,


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