From b14c73afd129a1db78ded6783da729cb7be87309 Mon Sep 17 00:00:00 2001
From: samhed <samuel@cendio.se>
Date: Fri, 13 May 2016 16:30:10 +0200
Subject: Allow touchmode for Microsoft Surface tablets

'ontouchstart' wasn't enough to detect touch on MS Surface devices
---
 include/ui.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/ui.js b/include/ui.js
index cfdedb3..91cad7c 100644
--- a/include/ui.js
+++ b/include/ui.js
@@ -53,7 +53,10 @@ var UI;
 
         // Render default UI and initialize settings menu
         start: function(callback) {
-            UI.isTouchDevice = 'ontouchstart' in document.documentElement;
+            UI.isTouchDevice = (('ontouchstart' in window)
+                                // required for MS Surface
+                                || (navigator.maxTouchPoints > 0)
+                                || (navigator.msMaxTouchPoints > 0));
 
             // Stylesheet selection dropdown
             var sheet = WebUtil.selectStylesheet();
-- 
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