inform instance.[width/height] about new layout data, closes #1068

Author: cpsievert

inst/htmlwidgets/plotly.js

@@ -166,10 +166,15 @@ HTMLWidgets.widget({
 
     } else {
 
+      // new x data could contain a new height/width...
+      // attach to instance so that resize logic knows about the new size
+      instance.width = x.layout.width || instance.width;
+      instance.height = x.layout.height || instance.height;
+      
       // this is essentially equivalent to Plotly.newPlot(), but avoids creating 
       // a new webgl context
       // https://github.com/plotly/plotly.js/blob/2b24f9def901831e61282076cf3f835598d56f0e/src/plot_api/plot_api.js#L531-L532
-      
+
       // TODO: restore crosstalk selections?
       Plotly.purge(graphDiv);
       // TODO: why is this necessary to get crosstalk working?