From 45d66a1264a585b4a2c6723999274602e495a266 Mon Sep 17 00:00:00 2001
From: Rachel Fenichel <fenichel@google.com>
Date: Thu, 3 Oct 2019 17:58:29 -0700
Subject: [PATCH] Get rid of unnecessary nulls in block dragger, insertion
 marker manager, and gesture dispose functions.

---
 core/block_dragger.js            |  4 ----
 core/gesture.js                  | 10 ----------
 core/insertion_marker_manager.js |  8 --------
 3 files changed, 22 deletions(-)

diff --git a/core/block_dragger.js b/core/block_dragger.js
index 7b8f3232b..f1b8a4f5b 100644
--- a/core/block_dragger.js
+++ b/core/block_dragger.js
@@ -100,14 +100,10 @@ Blockly.BlockDragger = function(block, workspace) {
  * @package
  */
 Blockly.BlockDragger.prototype.dispose = function() {
-  this.draggingBlock_ = null;
-  this.workspace_ = null;
-  this.startWorkspace_ = null;
   this.dragIconData_.length = 0;
 
   if (this.draggedConnectionManager_) {
     this.draggedConnectionManager_.dispose();
-    this.draggedConnectionManager_ = null;
   }
 };
 
diff --git a/core/gesture.js b/core/gesture.js
index f27dfa982..677feabae 100644
--- a/core/gesture.js
+++ b/core/gesture.js
@@ -250,24 +250,14 @@ Blockly.Gesture.prototype.dispose = function() {
     Blockly.unbindEvent_(this.onUpWrapper_);
   }
 
-
-  this.startField_ = null;
-  this.startBlock_ = null;
-  this.targetBlock_ = null;
-  this.startWorkspace_ = null;
-  this.flyout_ = null;
-
   if (this.blockDragger_) {
     this.blockDragger_.dispose();
-    this.blockDragger_ = null;
   }
   if (this.workspaceDragger_) {
     this.workspaceDragger_.dispose();
-    this.workspaceDragger_ = null;
   }
   if (this.bubbleDragger_) {
     this.bubbleDragger_.dispose();
-    this.bubbleDragger_ = null;
   }
 };
 
diff --git a/core/insertion_marker_manager.js b/core/insertion_marker_manager.js
index 62f46719c..85c23d43a 100644
--- a/core/insertion_marker_manager.js
+++ b/core/insertion_marker_manager.js
@@ -146,27 +146,19 @@ Blockly.InsertionMarkerManager = function(block) {
  * @package
  */
 Blockly.InsertionMarkerManager.prototype.dispose = function() {
-  this.topBlock_ = null;
-  this.workspace_ = null;
   this.availableConnections_.length = 0;
-  this.closestConnection_ = null;
-  this.localConnection_ = null;
 
   Blockly.Events.disable();
   try {
     if (this.firstMarker_) {
       this.firstMarker_.dispose();
-      this.firstMarker_ = null;
     }
     if (this.lastMarker_) {
       this.lastMarker_.dispose();
-      this.lastMarker_ = null;
     }
   } finally {
     Blockly.Events.enable();
   }
-
-  this.highlightedBlock_ = null;
 };
 
 /**