Add show in taskbar option.

src/Soloplan.WhatsON.GUI/Config/MainConfigPage.xaml

@@ -20,5 +20,9 @@
       <ToggleButton Style="{StaticResource MaterialDesignSwitchToggleButton}"  IsChecked="{Binding OpenOnSystemStart}" />
       <Label>Run when Windows starts</Label>
     </StackPanel>
+    <StackPanel Orientation="Horizontal">
+      <ToggleButton Style="{StaticResource MaterialDesignSwitchToggleButton}"  IsChecked="{Binding ShowInTaskbar}"/>
+      <Label>Show in Taskbar</Label>
+    </StackPanel>
   </StackPanel>
 </Page>

src/Soloplan.WhatsON.GUI/Config/ViewModel/ConfigViewModel.cs

@@ -38,6 +38,11 @@ public class ConfigViewModel : ViewModelBase
     /// </summary>
     private bool? openOnSystemStart;
 
+    /// <summary>
+    /// Backing field for <see cref="ShowInTaskbar"/>.
+    /// </summary>
+    private bool showInTaskbar;
+
     /// <summary>
     /// Occurs when configuration was applied.
     /// </summary>
@@ -66,6 +71,19 @@ public bool DarkThemeEnabled
       }
     }
 
+    /// <summary>
+    /// Gets or sets a value indicating whether window should be shown in taskbar.
+    /// </summary>
+    public bool ShowInTaskbar
+    {
+      get => this.showInTaskbar;
+      set
+      {
+        this.showInTaskbar = value;
+        this.OnPropertyChanged();
+      }
+    }
+
     /// <summary>
     /// Gets or sets a value indicating whether application should start with system.
     /// </summary>
@@ -161,6 +179,7 @@ public void Load(ApplicationConfiguration configurationSource)
         }
 
         this.DarkThemeEnabled = configurationSource.DarkThemeEnabled;
+        this.ShowInTaskbar = configurationSource.ShowInTaskbar;
         this.openOnSystemStart = null; // as this option is not really saved, we reset the private variable value.
         this.OnPropertyChanged(nameof(this.OpenOnSystemStart));
 
@@ -225,6 +244,7 @@ public void ApplyToSourceAndSave()
         }
 
         this.Configuration.DarkThemeEnabled = this.DarkThemeEnabled;
+        this.Configuration.ShowInTaskbar = this.ShowInTaskbar;
         this.ApplyRunWithWindowsOption();
         SerializationHelper.SaveConfiguration(this.Configuration);
       }

src/Soloplan.WhatsON.GUI/MainWindow.xaml.cs

@@ -32,6 +32,7 @@ public MainWindow(ObservationScheduler scheduler, ApplicationConfiguration confi
       this.scheduler = scheduler;
       this.config = configuration;
       this.mainTreeView.Init(this.scheduler, this.config, initialSubjectState);
+      this.ShowInTaskbar = this.config.ShowInTaskbar;
     }
 
     public MainWindowSettigns GetVisualSettigns()
@@ -99,6 +100,8 @@ private void ApplyConfiguration()
       {
         this.scheduler.Start();
       }
+
+      this.ShowInTaskbar = this.config.ShowInTaskbar;
     }
   }
 }

src/Soloplan.WhatsON/Serialization/ApplicationConfiguration.cs

@@ -18,6 +18,11 @@ public class ApplicationConfiguration
     /// </summary>
     public bool DarkThemeEnabled { get; set; }
 
+    /// <summary>
+    /// Gets or sets a value indicating whether icon on taskbar should be shown.
+    /// </summary>
+    public bool ShowInTaskbar { get; set; }
+
     /// <summary>
     /// Gets the subjects configuration.
     /// </summary>