[turbolizer] Fix a latent bug when dragging a node under another node.

tools/turbolizer/graph-view.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 "use strict";
 
 class GraphView extends View {
   constructor (d3, id, nodes, edges, broker) {
     super(id, broker);
     var graph = this;
@@ skipping 451 matching lines @@
 
   nodeMouseUp(d3node, d) {
     var graph = this,
     state = graph.state,
     consts = graph.consts;
 
     var mouseDownNode = state.mouseDownNode;
 
     if (!mouseDownNode) return;
 
-    if (mouseDownNode !== d){
-      // we're in a different node: create new edge for mousedown edge and add to graph
-      var newEdge = {source: mouseDownNode, target: d};
-      var filtRes = graph.visibleEdges.filter(function(d){
-        if (d.source === newEdge.target && d.target === newEdge.source){
-          graph.edges.splice(graph.edges.indexOf(d), 1);
-        }
-        return d.source === newEdge.source && d.target === newEdge.target;
-      });
-      if (!filtRes[0].length){
-        graph.edges.push(newEdge);
-        graph.updateGraphVisibility();
+    if (state.justDragged) {
+      // dragged, not clicked
+      state.justDragged = false;
+    } else{
+      // clicked, not dragged
+      var extend = d3.event.shiftKey;
+      var selection = graph.state.selection;
+      if (!extend) {
+        selection.clear();
       }
-    } else{
-      // we're in the same node
-      if (state.justDragged) {
-        // dragged, not clicked
-        state.justDragged = false;
-      } else{
-        // clicked, not dragged
-        var extend = d3.event.shiftKey;
-        var selection = graph.state.selection;
-        if (!extend) {
-          selection.clear();
-        }
-        selection.select(d3node[0][0], true);
-      }
+      selection.select(d3node[0][0], true);
     }
   }
 
   selectSourcePositions(start, end, selected) {
     var graph = this;
     var map = [];
     var sel = graph.nodes.filter(function(n) {
       var pos = (n.pos === undefined)
         ? -1
         : n.getFunctionRelativeSourcePosition(graph);
@@ skipping 469 matching lines @@
   }
 
   viewWholeGraph() {
     var graph = this;
     var minScale = graph.minScale();
     var translation = [0, 0];
     translation = graph.getVisibleTranslation(translation, minScale);
     graph.translateClipped(translation, minScale);
   }
 }