Add in-between step in drag simulation.
Add in-between step in drag simulation.

Helps catch cases where multiple mousemove events cause bugs.

danmane/plottable,iobeam/plottable,gdseller/plottable,onaio/plottable,RobertoMalatesta/plottable,gdseller/plottable,iobeam/plottable,palantir/plottable,palantir/plottable,jacqt/plottable,alyssaq/plottable,iobeam/plottable,palantir/plottable,palantir/plottable,danmane/plottable,onaio/plottable,jacqt/plottable,softwords/plottable,NextTuesday/plottable,RobertoMalatesta/plottable,NextTuesday/plottable,gdseller/plottable,danmane/plottable,alyssaq/plottable,softwords/plottable,NextTuesday/plottable,alyssaq/plottable,jacqt/plottable,RobertoMalatesta/plottable,softwords/plottable,onaio/plottable