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11d1d54c8a
- more dartdocs for the drag typedefs - more toStrings to aid debugging - require the position for DragUpdateDetails since we were omitting it in some places - add the primaryVelocity to DragEndDetails so that consumers don't have to themselves track the axis in question - fix the velocity tracker so that it doesn't walk the null data. Previously, near time t=0 (which pretty much only matters in tests, but it does matter there) we would walk the velocity data and then also walk missing data, treating it as Point.zero with t=0. - simplify some of the velocity tracker; e.g. instead of trying (and failing?) to clear the velocity tracker when the pointer stalls, just drop the data before a stall during the velocity estimation (where we redundantly had another bigger horizon anyway).
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