Added click handler to avoid double calls of click event handler.

lib/scatter.js

@@ -1142,6 +1142,17 @@ export class DOMScatter extends AbstractScatter {
             })
             this.resizeButton = button
         }
+        if (clickOnTap) {
+            /* Since the tap triggers a synthetic click event
+             we must prevent the original trusted click event which
+             is also dispatched by the system.
+            */
+            element.addEventListener('click', event => {
+                if (event.isTrusted) {
+                    Events.stop(event)
+                }
+            }, true)
+        }
         container.add(this)
     }
 
@@ -1302,23 +1313,24 @@ export class DOMScatter extends AbstractScatter {
     }
 
     onTap(event, interaction, point) {
-        
+
         if (this.clickOnTap) {
             let directNode = document.elementFromPoint(event.clientX, event.clientY)
-            console.log("onTap",  directNode, this.isClickable(directNode))
+            console.log("onTap", event)
             if (this.isClickable(directNode)) {
                 directNode.click()
             }
             else {
                 let nearestNode = this.nearestClickable(event)
                 if (this.isClickable(nearestNode)) {
-                    
+
                     if (nearestNode.tagName == 'svg') {
-                    let handler = this.tapNodes.get(nearestNode)
-                    console.log("Clicking beneath SVG: to be done", handler)
-                    Events.stop(event)
-                    return
+                        let handler = this.tapNodes.get(nearestNode)
+                        console.log("Clicking beneath SVG: to be done", handler)
+                        Events.stop(event)
+                        return
                     }
+                    console.log("nearestNode clicked")
                     nearestNode.click()
                 }
             }
@@ -1352,7 +1364,7 @@ export class DOMScatter extends AbstractScatter {
             return true
         if (node.hasAttribute("onclick"))
             return true
-        if (this.tapNodes.has(node)) 
+        if (this.tapNodes.has(node))
             return true
         return false
     }
@@ -1396,7 +1408,6 @@ export class DOMScatter extends AbstractScatter {
         let closestClickIndex = distances.indexOf(Math.min(...distances))
         let closestClickable = clickables[closestClickIndex]
         if (distances[closestClickIndex] < this.allowClickDistance) {
-            console.log("found closest clickables", closestClickable)
             return closestClickable
         }
         return null