Re: Cullng drawing depending on visibility events

[Keith Packard <keithp keithp com>]

Around 10 o'clock on Apr 4, Owen Taylor wrote:

> This can be omitted:
>  
> - If GDK_EXPOSURE_MASK is in the window's event mask, then 
>   it isn't necessary

No, this part is necessary -- a visibility event may not be followed by 
exposure events, or may be followed by exposure events which don't cover 
the entire visible region.  In either case, the application will need to 
somehow get the visible portion of the window repainted without knowing 
what that visible region is.

-keith