Feature request: Getting window position from pixel position

I'm sure this usecase is very esoteric, but I'm using egui with pixels and I wanted to put egui objects on the same screen location as objects I'm drawing on the pixel buffer, but to do that I need some way of going from pixel positions to window positions, and surprisingly there doesn't seem to be a way right now, even though there is a way to go from window position to pixel position via window_pos_to_pixel. Even without a crazy usecase like that, there are probably other scenarios where this would be something you want.

Start at the existing window_pos_to_pixel entry point and trace how window and pixel coordinates are represented and converted. Determine where the inverse conversion belongs and how its coordinate conventions should align with the existing API. Done means callers can obtain window positions from pixel positions with behavior consistent with window_pos_to_pixel.