UI - Unload current page when closing screen

UI - Restore last page when opening via double click on tray icon
Windows - Fixed settings tray menu item opening release tab

src/Artemis.UI/Screens/Root/BlankView.axaml

@@ -0,0 +1,7 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="Artemis.UI.Screens.Root.BlankView">
+</UserControl>

src/Artemis.UI/Screens/Root/BlankView.axaml.cs

@@ -0,0 +1,13 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Artemis.UI.Screens.Root;
+
+public partial class BlankView : UserControl
+{
+    public BlankView()
+    {
+        InitializeComponent();
+    }
+}

src/Artemis.UI/Screens/Root/BlankViewModel.cs

@@ -0,0 +1,9 @@
+using Artemis.UI.Shared;
+
+namespace Artemis.UI.Screens.Root;
+
+public class BlankViewModel : ViewModelBase, IMainScreenViewModel
+{
+    /// <inheritdoc />
+    public ViewModelBase? TitleBarViewModel => null;
+}

src/Artemis.UI/Screens/Root/RootViewModel.cs

@@ -58,7 +58,7 @@ public class RootViewModel : RoutableScreen<IMainScreenViewModel>, IMainWindowPr
         mainWindowService.ConfigureMainWindowProvider(this);
 
         DisplayAccordingToSettings();
-        OpenScreen = ReactiveCommand.Create<string>(ExecuteOpenScreen);
+        OpenScreen = ReactiveCommand.Create<string?>(ExecuteOpenScreen);
         OpenDebugger = ReactiveCommand.CreateFromTask(ExecuteOpenDebugger);
         Exit = ReactiveCommand.CreateFromTask(ExecuteExit);
         this.WhenAnyValue(vm => vm.Screen).Subscribe(UpdateTitleBarViewModel);
@@ -72,11 +72,13 @@ public class RootViewModel : RoutableScreen<IMainScreenViewModel>, IMainWindowPr
             registrationService.RegisterBuiltInDataModelDisplays();
             registrationService.RegisterBuiltInDataModelInputs();
             registrationService.RegisterBuiltInPropertyEditors();
+
+            _router.Navigate("home");
         });
     }
 
     public SidebarViewModel SidebarViewModel { get; }
-    public ReactiveCommand<string, Unit> OpenScreen { get; }
+    public ReactiveCommand<string?, Unit> OpenScreen { get; }
     public ReactiveCommand<Unit, Unit> OpenDebugger { get; }
     public ReactiveCommand<Unit, Unit> Exit { get; }
 
@@ -133,8 +135,11 @@ public class RootViewModel : RoutableScreen<IMainScreenViewModel>, IMainWindowPr
 
     #region Tray commands
 
-    private void ExecuteOpenScreen(string path)
+    private void ExecuteOpenScreen(string? path)
     {
+        if (path != null)
+            _router.ClearPreviousWindowRoute();
+        
         // The window will open on the UI thread at some point, respond to that to select the chosen screen
         MainWindowOpened += OnEventHandler;
         OpenMainWindow();
@@ -143,7 +148,8 @@ public class RootViewModel : RoutableScreen<IMainScreenViewModel>, IMainWindowPr
         {
             MainWindowOpened -= OnEventHandler;
             // Avoid threading issues by running this on the UI thread 
-            Dispatcher.UIThread.InvokeAsync(async () => await _router.Navigate(path));
+            if (path != null)
+                Dispatcher.UIThread.InvokeAsync(async () => await _router.Navigate(path));
         }
     }
 

src/Artemis.UI/Screens/Sidebar/SidebarViewModel.cs

@@ -1,7 +1,5 @@
 using System;
-using System.Collections.Generic;
 using System.Collections.ObjectModel;
-using System.Linq;
 using System.Reactive;
 using System.Reactive.Disposables;
 using System.Reactive.Linq;
@@ -88,7 +86,6 @@ public class SidebarViewModel : ActivatableViewModelBase
 
             SidebarCategories = categoryViewModels;
         });
-        SelectedScreen = SidebarScreen.Screens.First();
     }
 
     public SidebarScreenViewModel SidebarScreen { get; }