cb85a0a521
* control points that were already closer than one_tick_in_pixels were able to move beyond adjacent points, resulting in out-of-order lines * prior code was using 'one tick' as the smallest spacing between two CPs, but that is larger than the default 'guard point' spacing. this resulted in odd behavior because of the dxt calculation when you moved a point that was created as a 'guard point' For now, use the same 64 samples we use for 'guard points'. And change the 'dxt' calculation logic to more aggressively limit the points from overlapping. TODO: we might decide that 'one tick' should be the minimum automation period throughout ardour. In that case we should change guard-points.
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