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This bug covers making visibleContentRect cross-platform. visibleWidth and visibleHeight should just be implemented in terms of visibleContentRect.
Created an attachment (id=23822) [details]
(From update of attachment 23822 [details])
+ int width = GetClientSize(NULL, &width);
+ int height = GetClientSize(NULL, &height);
I don't think this works.
Fixed in r36909.