sankey: do not stash initial view for traces not visible

Author: antoinerg

src/traces/sankey/plot.js

@@ -129,6 +129,7 @@ module.exports = function plot(gd, calcData) {
 
     // stash initial view
     for(var i = 0; i < gd._fullData.length; i++) {
+        if(!gd._fullData[i].visible) continue;
         if(gd._fullData[i].type !== cn.sankey) continue;
         if(!gd._fullData[i]._viewInitial) {
             var node = gd._fullData[i].node;