Update

Author: 0x5bfa

src/Files.App.Controls/ThemedIcon/ThemedIcon.Properties.cs

@@ -6,15 +6,15 @@
 
 namespace Files.App.Controls
 {
-	[DependencyProperty<string>("FilledIconData", nameof(OnFilledIconPropertyChanged))]
-	[DependencyProperty<string>("OutlineIconData", nameof(OnOutlineIconPropertyChanged))]
+	[DependencyProperty<string>("FilledIconData", nameof(OnFilledIconPropertyChanged), DefaultValue = "string.Empty")]
+	[DependencyProperty<string>("OutlineIconData", nameof(OnOutlineIconPropertyChanged), DefaultValue = "string.Empty")]
 	[DependencyProperty<Brush>("Color", nameof(OnColorPropertyChanged))]
-	[DependencyProperty<ThemedIconTypes>("IconType", nameof(OnIconTypePropertyChanged))]
-	[DependencyProperty<ThemedIconColorType>("IconColorType", nameof(OnIconColorTypePropertyChanged))]
-	[DependencyProperty<double>("IconSize", nameof(OnIconSizePropertyChanged))]
-	[DependencyProperty<bool>("IsToggled", nameof(OnIsToggledPropertyChanged))]
-	[DependencyProperty<bool>("IsFilled", nameof(OnIsFilledPropertyChanged))]
-	[DependencyProperty<bool>("IsHighContrast", nameof(OnIsHighContrastPropertyChanged))]
+	[DependencyProperty<ThemedIconTypes>("IconType", nameof(OnIconTypePropertyChanged), DefaultValue = "ThemedIconTypes.Layered")]
+	[DependencyProperty<ThemedIconColorType>("IconColorType", nameof(OnIconColorTypePropertyChanged), DefaultValue = "ThemedIconColorType.None")]
+	[DependencyProperty<double>("IconSize", nameof(OnIconSizePropertyChanged), DefaultValue = "(double)16")]
+	[DependencyProperty<bool>("IsToggled", nameof(OnIsToggledPropertyChanged), DefaultValue = "false")]
+	[DependencyProperty<bool>("IsFilled", nameof(OnIsFilledPropertyChanged), DefaultValue = "false")]
+	[DependencyProperty<bool>("IsHighContrast", nameof(OnIsHighContrastPropertyChanged), DefaultValue = "false")]
 	[DependencyProperty<object>("Layers", nameof(OnLayersPropertyChanged))]
 	public partial class ThemedIcon : Control
 	{

src/Files.App/UserControls/DataGridHeader.xaml.cs

@@ -3,7 +3,6 @@
 
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
-using System.Runtime.CompilerServices;
 using System.Windows.Input;
 
 namespace Files.App.UserControls