Merge pull request #842 from monfera/general-speedup

use extendDeepNoArrays in plotly.restyle event emission

Author: etpinard

src/plot_api/plot_api.js

@@ -2042,7 +2042,7 @@ Plotly.restyle = function restyle(gd, astr, val, traces) {
     if(!plotDone || !plotDone.then) plotDone = Promise.resolve();
 
     return plotDone.then(function() {
-        gd.emit('plotly_restyle', Lib.extendDeep([], [redoit, traces]));
+        gd.emit('plotly_restyle', Lib.extendDeepNoArrays([], [redoit, traces]));
         return gd;
     });
 };