DispatcherTimer should now swallow exceptions

src/Perspex.Base/Threading/Dispatcher.cs

@@ -73,9 +73,10 @@ namespace Perspex.Threading
         /// Post action that will be invoked on main thread
         /// </summary>
         /// <param name="action">The method.</param>
-        internal void Post(Action action)
+        /// <param name="priority">The priority with which to invoke the method.</param>
+        internal void Post(Action action, DispatcherPriority priority = DispatcherPriority.Normal)
         {
-            this.mainLoop.Post(action);
+            this.mainLoop.Post(action, priority);
         }
     }
 }

src/Perspex.Base/Threading/DispatcherTimer.cs

@@ -203,7 +203,7 @@ namespace Perspex.Threading
         /// </summary>
         private void InternalTick()
         {
-            this.Dispatcher.InvokeAsync(this.RaiseTick, this.priority);
+            this.Dispatcher.Post(this.RaiseTick, this.priority);
         }
 
         /// <summary>

src/Perspex.Base/Threading/MainLoop.cs

@@ -108,9 +108,11 @@ namespace Perspex.Win32.Threading
         /// Post action that will be invoked on main thread
         /// </summary>
         /// <param name="action">The method.</param>
-        internal void Post(Action action)
+        /// 
+        /// <param name="priority">The priority with which to invoke the method.</param>
+        internal void Post(Action action, DispatcherPriority priority)
         {
-            this.AddJob(new Job(action, DispatcherPriority.Normal, true));
+            this.AddJob(new Job(action, priority, true));
         }
 
         private void AddJob(Job job)