Date:	Sun, 30 Jul 2000 09:42:21 +0300 (IDT)
From:	Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
X-Sender:	eliz AT is
To:	Ian Miller <Ian AT shelob DOT f9 DOT co DOT uk>
cc:	djgpp-workers AT delorie DOT com
Subject:	Re: MS mouse with wheel
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On Sat, 29 Jul 2000, Ian Miller wrote:

> > On a Windows 9X system with an MS mouse that has a wheel (between the two
> > buttons), I see a strange phenomenon.  When a DJGPP program (Emacs in
> > this case) initializes the mouse driver, the returned info says that the
> > mouse has 3 buttons.
> 
> I do not know how to confirm or deny that observation.

Like I did: run Emacs under GDB, put a breakpoint in the dos_ttraw
function, where Emacs initializes the mouse driver and figures out how
many buttons does it have, and see what does function 21h of Int 33h
returns in the BX register.  Or just write a short program that calls
function 21h of Int 33h, and see what it yields.

The idea that this might be the problem struck me when "C-h l" showed
that Emacs thought I clicked mouse-3 instead of mouse-2 for the right
button.

> > The problem with Emacs is that it thinks that the right
> > button is mouse-3, and mouse-2 is absent.
> 
> And you are, for example, unable to navigate a directory structure
> using dired using just the mouse. Me too. Yuck!

I can easily repair that, by providing a function to forcibly set
Emacs' notion of the number of mouse buttons from Lisp; users could
then avoid the problem by calling that function from their .emacs init
file.

I posted my message to make sure it wasn't something specific to the
machine where I saw the problem.

Thanks for the feedback.  I think I have my confirmation now, and can
proceed with the solution.

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