application should automatically inherit X screen?

[Leszek Koltunski <leszek koltunski pl>]

Hello,

I have a dual screen setup ( no xinerama, just 2 X screens ) and for a
long time I have been seeing the following bugs: if, being on the
secondary screen, I try to launch an application, its window would pop
up in the primary X screen.

I have been bugging Gnome about that and recently I stumbled upon a bug:

https://bugzilla.gnome.org/show_bug.cgi?id=583452

which suggests ( more specifically, Matt Keenan's patch in there) that
each GTK application has to explicitly call 

gtk_window_set_screen() 

in order to inherit the X screen from its parent and thus be multihead
aware. ( I guess it the application does not call this, it will always
pop up in screen 0 ? Sorry, I have little experience with GTK)

I just checked my Ubuntu 9.10 Beta setup and it turns out that the
following:

- tomboy
- mail-notification
- policykit-gnome ( its authentication dialog )
- parts of gnome-panel
- indicator applet

suffer from this bug. Furthermore, other important parts of Gnome ( like
the gnome-mixer in the bug above ) have only recently been fixed. 

Now, the question: couldn't GTK+ automatically figure this one out? 
If it does not, we will keep stumbling upon application whose developers
forgot about this since most of them do not run a dual screen setup...