UI - Large amount of memory improvements in the VMs

Core - Minor memory improvements

src/Artemis.UI/Behaviors/InputBindingBehavior.cs

@@ -1,9 +1,15 @@
-using System.Windows;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Windows;
+using System.Windows.Input;
 
 namespace Artemis.UI.Behaviors
 {
     public class InputBindingBehavior
     {
+        private static List<Tuple<FrameworkElement, Window, InputBinding>> _movedInputBindings = new List<Tuple<FrameworkElement, Window, InputBinding>>();
+
         public static readonly DependencyProperty PropagateInputBindingsToWindowProperty =
             DependencyProperty.RegisterAttached("PropagateInputBindingsToWindow", typeof(bool), typeof(InputBindingBehavior),
                 new PropertyMetadata(false, OnPropagateInputBindingsToWindowChanged));
@@ -21,13 +27,13 @@ namespace Artemis.UI.Behaviors
         private static void OnPropagateInputBindingsToWindowChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
         {
             ((FrameworkElement) d).Loaded += OnLoaded;
+            ((FrameworkElement) d).Unloaded += OnUnloaded;
         }
 
         private static void OnLoaded(object sender, RoutedEventArgs e)
         {
             var frameworkElement = (FrameworkElement) sender;
-            frameworkElement.Loaded -= OnLoaded;
-
+           
             var window = Window.GetWindow(frameworkElement);
             if (window == null) return;
 
@@ -37,7 +43,23 @@ namespace Artemis.UI.Behaviors
                 var inputBinding = frameworkElement.InputBindings[i];
                 window.InputBindings.Add(inputBinding);
                 frameworkElement.InputBindings.Remove(inputBinding);
+
+                _movedInputBindings.Add(new Tuple<FrameworkElement, Window, InputBinding>(frameworkElement, window, inputBinding));
             }
         }
+
+        private static void OnUnloaded(object sender, RoutedEventArgs e)
+        {
+            var frameworkElement = (FrameworkElement) sender;
+
+            var toRemove = _movedInputBindings.Where(m => m.Item1 == frameworkElement).ToList();
+            foreach (var (_, window, inputBinding) in toRemove)
+            {
+                if (window.InputBindings.Contains(inputBinding))
+                    window.InputBindings.Remove(inputBinding);
+            }
+
+            _movedInputBindings = _movedInputBindings.Where(b => b.Item1 != frameworkElement).ToList();
+        }
     }
 }