Only prevent repeated polygon pixels when drawing with transparency #5835
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#4333 prevented polygon pixels from being drawn more than once, so that the transparencies of pixels would not be combined to create an unintended result.
However, #5700 reported that this results in a speed decrease.
This PR switches back to the earlier, faster method of drawing pixels repeatedly - when drawing without transparency. This means that the slower method to avoid the transparency problem is not used when it does not need to be used.