Widgets should be getting sized according to their container, eg, Window widgets stack their children on top of each other such that a Canvas behind a Projector should show the Canvas image behind the 3d scene.

However, right now Canvas.size defaults to (0,0) and isn't getting resized properly, you need to do an extra step of window[0].size = window.size at creation and everytime the window is resized.

Fix that.

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