From 8e9f9e0a30d5da540e750f1aa33b647aa8e903fa Mon Sep 17 00:00:00 2001
From: Kenny2github <kenny2minecraft@gmail.com>
Date: Wed, 9 May 2018 08:13:04 +0800
Subject: [PATCH] Add one to index if random costume is current costume

---
 src/blocks/scratch3_looks.js | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/blocks/scratch3_looks.js b/src/blocks/scratch3_looks.js
index a2c9dbefb..310d9a3de 100644
--- a/src/blocks/scratch3_looks.js
+++ b/src/blocks/scratch3_looks.js
@@ -346,11 +346,9 @@ class Scratch3LooksBlocks {
             } else if (requestedCostume === 'random backdrop') {
                 const numCostumes = target.getCostumes().length;
                 if (numCostumes > 1) {
-                    let index;
-                    do {
-                        index = Math.floor(Math.random() * numCostumes);
-                    } while (index === target.currentCostume);
-                    target.setCostume(index);
+                    let selectedIndex = Math.floor(Math.random() * (numCostumes - 1));
+                    if (selectedIndex === target.currentCostume) selectedIndex += 1;
+                    target.setCostume(selectedIndex);
                 }
             } else {
                 const forcedNumber = Number(requestedCostume);