Why is epaint::shape::ViewportInPixels is not exported?

[Ababwa]

I figured it'd be appropriate to ask if there is a reason epaint::shape::ViewportInPixels is not exported before submitting a PR. Instances can be obtained from egui::PaintCallbackInfo by calling viewport_in_pixels or clip_rect_in_pixels.

A user of these methods (such as myself) may want to move these instances around before finally accessing their contents. The unavailability of the type symbol makes this difficult and necessitates creating a copy of the type and copying the contents, or some other workaround.

Thank you.