stream-to-stream-units

Arguments: from-window-or-screen to-window-or-screen position-or-box

Converts a position or box from being relative to the logical interior upper left corner of the first window (from-window) to being relative the logical interior upper left corner of the second window (to-window). "Logical" here means that stream units are offset from the physical window position according to the scroll position and origin of the window.

Destructively modifies the position or box argument.

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Created 2012.5.30.