add dummy 'wheel' event handler to enable scroll zoom on safari

Author: emilykl

src/plot_api/plot_api.js

@@ -3663,6 +3663,12 @@ function makePlotFramework(gd) {
     var gd3 = d3.select(gd);
     var fullLayout = gd._fullLayout;
 
+    // Add dummy event handler for 'wheel' event for Safari
+    // to enable mouse wheel zoom
+    // https://github.com/d3/d3/issues/3035
+    // https://github.com/plotly/plotly.js/issues/7452
+    gd3.on('wheel', function() {});
+
     fullLayout._calcInverseTransform = calcInverseTransform;
     fullLayout._calcInverseTransform(gd);