From d919b4369d64e11ccefc7327af8bc89f395bc9e6 Mon Sep 17 00:00:00 2001
From: Andrew Au <cshung@gmail.com>
Date: Tue, 12 Mar 2019 09:50:49 -0700
Subject: [PATCH] Fix issue 2061 (#2326)

---
 blocks/lists.js | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/blocks/lists.js b/blocks/lists.js
index 011b4364f..4e9d3b5e2 100644
--- a/blocks/lists.js
+++ b/blocks/lists.js
@@ -829,6 +829,21 @@ Blockly.Blocks['lists_split'] = {
    * @this Blockly.Block
    */
   updateType_: function(newMode) {
+    var mode = this.getFieldValue('MODE');
+    if (mode != newMode) {
+      this.setFieldValue(newMode, 'MODE');
+      var inputConnection = this.getInput('INPUT').connection;
+      inputConnection.setShadowDom(null);
+      var inputBlock = inputConnection.targetBlock();
+      if (inputBlock) {
+        inputConnection.disconnect();
+        if (inputBlock.isShadow()) {
+          inputBlock.dispose();
+        } else {
+          this.bumpNeighbours_();
+        }
+      }
+    }
     if (newMode == 'SPLIT') {
       this.outputConnection.setCheck('Array');
       this.getInput('INPUT').setCheck('String');