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Likely with the change to SDL's 'captured mouse' mode, mouse movements during fullscreen became deltas *from the last movement*, not from the last sampled position or frame. In order to correctly measure the mouse movement, the deltas must be summed up and then reset when 'read' at input-processing time. Moving to summing the deltas threw many other mouse-related calibration factors out of whack, so these factors are re-determined empirically across a range of mice, from 400dpi 125hz to 30,000dpi 8khz. Reasonable defaults are chosen targeting an 'average' mouse of 1000dpi, and the mouse sensitivity precision is increased to allow finer user tuning.