Duncan:
>> FWIW. my first comment, without having investigated further, is that
>> as long as we are consistently using platforms that all start with
>> (0,0) in the top left corner, we should not allow negative height and
>> width at all. I'm not even sure about allowing zero height and width.
>> ...

Matt:
> Negative coordinates are easly possible, common, and valid. x and y
> can become negative if a window is moved across the left or top of
> the main screen. But even the right and bottom coordinate of a
> widget can be negative with the widget visible, for example in a
> left-handed dual screen setup. That is, the right screen has the
> OS Menu Bar, and the left screen then may have negative coordinates.

Yes, you are right. I hadn't considered multi-head displays. I was
thinking more along the lines of new [single head] device contexts.

I stand corrected.
D.
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