Re: Problems with expose_event->region patch

[Alexander Larsson <alla lysator liu se>]

I commited this now. Some comments.

On 8 Mar 2001, Owen Taylor wrote:

> > + * @returns: the intersection of @widget and @region
>
>   A newly allocated region holding the intersection of @widget
>   and @region. The coordinates of the return value are
>   relative to widget->window for NO_WINDOW widgets, and
>   relative to the widget's allocation for widgets with their
>   own window.
>
> Actually, the funky coordinate system for the return value is that way
> because gtk_widget_intersect() was used for ::draw propagation and
> that was the coordinate system that was used for the argument to
> ::draw.
>
> Now that ::draw is gone, I think we should simply make
> gtk_widget_region_intersect() return coordinates relative to
> widget->window. The question then is - should gtk_widget_intersect()
> be changed to match?

You mean relative to parent window (for window widgets)? That is what I
did in the version i comittted.

> It's strange having them be different, and I the number of people who
> actually understand the way the coordinate systems used to work is
> tiny, but then again, there will be one person, somewhere, who will
> have a _HARD_ bug to track down if we change it.

I leave such decisions to you.

/ Alex