From 9b4a34933f1645234263b12e5103343e5158f89d Mon Sep 17 00:00:00 2001
From: Tian L <60599517+tian-lt@users.noreply.github.com>
Date: Thu, 15 Apr 2021 12:48:55 +0800
Subject: [PATCH] fixes crash in MathRichEditBox.ctor() (#14)

* fixes crash in MathRichEditBox.ctor()

* typo
---
 src/Calculator/Controls/MathRichEditBox.cs | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/Calculator/Controls/MathRichEditBox.cs b/src/Calculator/Controls/MathRichEditBox.cs
index 73aefac2..23966eb3 100644
--- a/src/Calculator/Controls/MathRichEditBox.cs
+++ b/src/Calculator/Controls/MathRichEditBox.cs
@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 using System;
@@ -8,7 +8,7 @@ using Windows.UI.Core;
 using Windows.UI.Text;
 using Windows.UI.Xaml;
 using Windows.UI.Xaml.Input;
-//using Microsoft.WRL;
+using Windows.ApplicationModel;
 
 namespace CalculatorApp
 {
@@ -84,6 +84,23 @@ namespace CalculatorApp
         {
             public MathRichEditBox()
             {
+                string packageName = Package.Current.Id.Name;
+
+                if(packageName == "Microsoft.WindowsCalculator.Dev")
+                {
+                    LimitedAccessFeatures.TryUnlockFeature(
+                                "com.microsoft.windows.richeditmath",
+                                "BeDD/jxKhz/yfVNA11t4uA==", // Microsoft.WindowsCalculator.Dev
+                                "8wekyb3d8bbwe has registered their use of com.microsoft.windows.richeditmath with Microsoft and agrees to the terms of use.");
+                }
+                else if(packageName == "Microsoft.WindowsCalculator")
+                {
+                    LimitedAccessFeatures.TryUnlockFeature(
+                                "com.microsoft.windows.richeditmath",
+                                "pfanNuxnzo+mAkBQ3N/rGQ==", // Microsoft.WindowsCalculator
+                                "8wekyb3d8bbwe has registered their use of com.microsoft.windows.richeditmath with Microsoft and agrees to the terms of use.");
+                }
+
                 TextDocument.SetMathMode(RichEditMathMode.MathOnly);
                 LosingFocus += OnLosingFocus;
                 KeyUp += OnKeyUp;