Camera::viewport_to_world_2d behavior on outside-of-viewport locations

[ericseppanen]

I have called window.cursor_position() to get a logical pixel location, and then called camera.viewport_to_world_2d(camera_transform, cursor_pos) to get its world location. To my surprise, that call returns Some even if the click is outside that camera's viewport, which is a surprise in a window with multiple cameras/viewports.

Is this desirable? I would have expected viewport_to_world_2d to do a bounds check on the viewport, and return None if the click isn't within the viewport.

Is there a better way to get the mouse position within a specific camera+viewport, and ignore everything that happens elsewhere in the window?