Fixed spacing.

src/Gtk/Avalonia.Gtk/WindowImpl.cs

@@ -115,9 +115,9 @@ namespace Avalonia.Gtk
 
             return Disposable.Empty;
         }
-		
+
         public override void SetSystemDecorations(bool enabled) => Window.Decorated = enabled;
-		
+
         public override void SetIcon(IWindowIconImpl icon)
         {
             Window.Icon = ((IconImpl)icon).Pixbuf;

src/Gtk/Avalonia.Gtk/WindowImplBase.cs

@@ -123,7 +123,7 @@ namespace Avalonia.Gtk
 
         public Action<Size> Resized { get; set; }
 		
-		public Action<Point> PositionChanged { get; set; }
+        public Action<Point> PositionChanged { get; set; }
 
         public Action<double> ScalingChanged { get; set; }