Fixed toast and sound notifications.

Tomighty.Core/Duration.cs

@@ -39,6 +39,16 @@ public string ToTimeString()
         }
 
         public static bool operator ==(Duration a, Duration b) => a.Seconds == b.Seconds;
-        public static bool operator !=(Duration a, Duration b) => a.Seconds != b.Seconds;
+        public static bool operator !=(Duration a, Duration b) => a.Seconds != b.Seconds;
+
+        public override bool Equals(object obj)
+        {
+            return obj is Duration other && Seconds == other.Seconds;
+        }
+
+        public override int GetHashCode()
+        {
+            return Seconds;
+        }
     }
 }

Tomighty.Core/PomodoroEngine.cs

@@ -15,6 +15,7 @@ public class PomodoroEngine : IPomodoroEngine
         private readonly IUserPreferences userPreferences;
         private readonly IEventHub eventHub;
         private int _pomodoroCount;
+        public static PomodoroEngine pomodoroEngine;
 
         public PomodoroEngine(ITimer timer, IUserPreferences userPreferences, IEventHub eventHub)
         {
@@ -23,6 +24,7 @@ public PomodoroEngine(ITimer timer, IUserPreferences userPreferences, IEventHub
             this.eventHub = eventHub;
 
             eventHub.Subscribe<TimerStopped>(OnTimerStopped);
+            pomodoroEngine = this;
         }
 
         public int PomodoroCount

Tomighty.Windows/App.config

@@ -1,6 +1,6 @@
-<?xml version="1.0" encoding="utf-8" ?>
+<?xml version="1.0" encoding="utf-8"?>
 <configuration>
     <startup> 
-        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2"/>
     </startup>
-</configuration>
+</configuration>