Made notifications work again, activation doesn't work yet due to missing ToastActivatorCLSID on the shortcut.

GreenshotWin10Plugin/Native/NotificationActivator.cs

@@ -0,0 +1,35 @@
+// ******************************************************************
+// Copyright (c) Microsoft. All rights reserved.
+// This code is licensed under the MIT License (MIT).
+// THE CODE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH
+// THE CODE OR THE USE OR OTHER DEALINGS IN THE CODE.
+// ******************************************************************
+
+using GreenshotWin10Plugin.Native.Structs;
+
+namespace GreenshotWin10Plugin.Native
+{
+    /// <summary>
+    /// Apps must implement this activator to handle notification activation.
+    /// </summary>
+    public abstract class NotificationActivator : INotificationActivationCallback
+    {
+        public void Activate(string appUserModelId, string invokedArgs, NotificationUserInputData[] data, uint dataCount)
+        {
+            OnActivated(invokedArgs, new NotificationUserInput(data), appUserModelId);
+        }
+
+        /// <summary>
+        /// This method will be called when the user clicks on a foreground or background activation on a toast. Parent app must implement this method.
+        /// </summary>
+        /// <param name="arguments">The arguments from the original notification. This is either the launch argument if the user clicked the body of your toast, or the arguments from a button on your toast.</param>
+        /// <param name="userInput">Text and selection values that the user entered in your toast.</param>
+        /// <param name="appUserModelId">Your AUMID.</param>
+        public abstract void OnActivated(string arguments, NotificationUserInput userInput, string appUserModelId);
+    }
+}