From 5b46652e90b8a87431abe0deafbf4b3382301ee3 Mon Sep 17 00:00:00 2001
From: Neil Fraser <fraser@google.com>
Date: Wed, 11 Dec 2019 01:24:51 -0800
Subject: [PATCH] Restore support for 0-length grid lines.

Resolves #3503
---
 core/options.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/core/options.js b/core/options.js
index 856bd4ce4..80fc49bda 100644
--- a/core/options.js
+++ b/core/options.js
@@ -270,7 +270,8 @@ Blockly.Options.parseGridOptions_ = function(options) {
   var gridOptions = {};
   gridOptions.spacing = Number(grid['spacing']) || 0;
   gridOptions.colour = grid['colour'] || '#888';
-  gridOptions.length = Number(grid['length']) || 1;
+  gridOptions.length =
+      (grid['length'] === undefined) ? 1 : Number(grid['length']);
   gridOptions.snap = gridOptions.spacing > 0 && !!grid['snap'];
   return gridOptions;
 };