From 7586f7e08650590e800942037a343d32157d2577 Mon Sep 17 00:00:00 2001
From: pwelby <pwelby@users.noreply.github.com>
Date: Thu, 5 Oct 2017 23:53:14 -0400
Subject: [PATCH] Disable source switcher during walkthrough

Closes #4401 -- fixed as proposed in the issue's comments
---
 modules/ui/source_switch.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/modules/ui/source_switch.js b/modules/ui/source_switch.js
index 244e26b465..475cd48016 100644
--- a/modules/ui/source_switch.js
+++ b/modules/ui/source_switch.js
@@ -13,6 +13,7 @@ export function uiSourceSwitch(context) {
 
     function click() {
         d3_event.preventDefault();
+        if (context.inIntro()) return;
 
         if (context.history().hasChanges() &&
             !window.confirm(t('source_switch.lose_changes'))) return;