Re: Binding mouse key sequences

[greenwaters <regularclockwork@gmail.com>]

Thank you for answering Michael. 
I'll try to answer your questions adding some new facts.

1. Yes, it happens with emacs -Q.

2. After calling emacs -Q, C-h k mouse-8 gives

 <mouse-8> (translated from <down-mouse-8> <mouse-8>) at that spot is
undefined

Similar behaviour for C-h k mouse-9.
After binding with 

(global-set-key   [mouse-8 mouse-9] 'write-file)

C-h k mouse-8 gives

byte-code: Empty menu

3. However, after binding with

(global-set-key   [mouse-8] 'write-file)

C-h k mouse-8 gives the usual info 

<mouse-8> (translated from <down-mouse-8> <mouse-8>) at that spot runs
the command write-file, which is an interactive compiled Lisp
function.

It is bound to <mouse-8>, C-x C-w, <menu-bar> <file> <write-file>.

etc.

and mouse-8 pops up the file selector window.

4. Now, setting 

 (global-set-key [mouse-8 mouse-9] 'write-file) 

and executing

(progn
    (push 'mouse-9 unread-command-events)
    (push 'mouse-8 unread-command-events))

does indeed call write-file.

5. I used xev to catch mouse key press events in Xorg: both mouse-8 and
mouse-9 are recognized. This does not tell me much, however, because the
test used xev's own window. When I tell xev to monitor any other window,
e.g., emacs, mouse clicks are not catched by xev. 

6. Setting the debug variable to true gives simply 

Debugger entered--Lisp error: (error "Empty menu")

I replicated the tests above using mouse-3 instead of mouse-8 and mouse-2
instead of mouse-9. Therefore I doubt there's any relation with high
numbered mouse buttons in Xorg.

This is all I was able to find out, with one addition: double-mouse-8 or
drag-mouse-8 always pops up a menu with just two entries, "tool bar" and
"Menu bar", both giving access to submenus. The former has entries for all
the buttons in the emacs tool bar, but all entries seem disabled. The latter
equals the Lisp-Interaction menu (I am performing tests inside the scratch
buffer). Same using mouse-3 and mouse-2, or using S-mouse-3 and mouse-2;
therefore it looks definitely as an effect of using global-set-key, and not
some predefined undocumented behavior. Moreover, globally unsetting
double-mouse-8 leaves that menu still functional.

BTW I am using 

GNU Emacs 23.4.1 (i486-pc-linux-gnu, GTK+ Version 2.24.10)
GNU Emacs 23.4.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.10)

on Debian Wheezy.

Any further hint is welcomed.




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