clear calcdata before redoing it in animations

Author: alexcjohnson

src/plots/plots.js

@@ -1813,6 +1813,10 @@ plots.transition = function(gd, data, layout, traces, frameOpts, transitionOpts)
         // of essentially the whole supplyDefaults step, so that it seems sensible to just use
         // supplyDefaults even though it's heavier than would otherwise be desired for
         // transitions:
+
+        // first delete calcdata so supplyDefaults knows a calc step is coming
+        delete gd.calcdata;
+
         plots.supplyDefaults(gd);
 
         plots.doCalcdata(gd);