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93d876891d
Replace the current score keeping algorithm with a rolling counter that's incremented in ExaOffscreenMarkUsed, with the previous value being stored in the area. exaOffscreenAlloc uses the difference between the counter value and the value in the area when deciding which area to evict. It now also takes the size of the areas into account, and favors evicting smaller areas. The credit for these ideas goes to Michel Dänzer.