[AD] (OS X) mouse button number reported

[Evert Glebbeek <eglebbk@xxxxxxxxxx>]

As I mentioned previously, when I ran ex_events, the display would  
show the right mouse button lighting up when I clicked (with the one  
button I have). Investigating, there seems to be an inconsistency  
between how _al_osx_mouse_generate_event numbers the buttons starting  
from 1 and the way ex_events expects them to be ordered starting from 0.
Assuming that's also how they're numbered on other platforms, the  
attached patch fixes the problem. Please confirm that this is correct  
(although Peter Wang already more or less did that when he said the  
primary mouse button should highlight the left box).

On a related issue, the same chunk of code in qzmouse records the  
change in a variable b_change, which is then used to set  
osx_mouse.state.buttons, which doesn't seem to be used again anywhere  
else (according to grep). However, b_change is only set when the key  
state changes to "down". Should this be fixed, or can the  
osx_mouse.state.buttons part be removed completely?

Evert

Attachment: qzmouse.diff
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