binary compatibility considerations wrt multihead support

[Erwann Chenede <Erwann Chenede Sun COM>]

Hi all,

While implementing multihead support I've added member variables 
to various widgets struct (e.g. GtkWindow, GtkInvisible, etc.).
These structs are opaque but I'm wondering if, for binary
compatibility, some padding should be added to prevent
any breakage if someone explicitly uses these struct size ?

AFAIK all the others objects I've modified are either fully internal
to gdk or deprecated.

On the API compatibility side I wondering how to handle/modify
GdkPointerHooks to support multihead.

At the moment we have GdkPointerHooks defining get_window_at_pointer
function like this :
GdkWindow* (*window_at_pointer) (gint            *win_x,
                                 gint            *win_y);
To make it work for multihead, I'll need sometime like this :
GdkWindow* (*window_at_pointer) (GdkScreen       *screen,
				 gint            *win_x,
                                 gint            *win_y);                                 

What would be the best way to make it compatible with multihead support ?

Cheers,

Erwann

[ I speak for myself, not for my employer. ]
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  Erwann Chénedé, Sun Microsystems Ireland
  Desktop Applications & Middleware Group
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