the ideal situation is to NOT have a window in the shower. Its like a sun roof, they will eventually leak.
But, if a window is the plan, I would put it as high as possible as to make sure that the direct flow of water from the shower head cannot get into the works of the window and especially on the sill.
Also design the sill so that it has a greater than normal fall toward the shower pan so to get optimal drain and fall.
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