feat: ensure initial state is respected in EnumSelector

src/Ursa/Controls/EnumSelector/EnumSelector.cs

@@ -34,6 +34,7 @@ public class EnumSelector: TemplatedControl
     private static object? OnValueCoerce(AvaloniaObject o,  object? value)
     {
         if (o is not EnumSelector selector) return null;
+        if (!selector.IsInitialized) return value;
         if (value is null) return null;
         if (value.GetType() != selector.EnumType) return null;
         var first = selector.Values?.FirstOrDefault(a => Equals(a.Value, value));
@@ -128,6 +129,8 @@ public class EnumSelector: TemplatedControl
             return;
         }
         Values = GenerateItemTuple();
+        var first = Values?.FirstOrDefault(a => Equals(a.Value, this.Value));
+        SetCurrentValue(SelectedValueProperty, first);
     }
 
     // netstandard 2.0 does not support Enum.GetValuesAsUnderlyingType, which is used for native aot compilation

tests/HeadlessTest.Ursa/Controls/EnumSelectorTests/InitialStateTest.cs

@@ -0,0 +1,24 @@
+using Avalonia.Controls;
+using Avalonia.Headless.XUnit;
+using Ursa.Controls;
+
+namespace HeadlessTest.Ursa.Controls.EnumSelectorTests;
+
+public class InitialStateTest
+{
+    [AvaloniaFact]
+    public void Initial_State_Respected()
+    {
+        var window = new Window();
+        var selector = new EnumSelector()
+        {
+            Value = HorizontalPosition.Right,
+            EnumType = typeof(HorizontalPosition),
+        };
+        window.Content = selector;
+        window.Show();
+        Assert.Equal(HorizontalPosition.Right, selector.Value);
+        Assert.NotNull(selector.SelectedValue);
+        Assert.Equal(HorizontalPosition.Right, selector.SelectedValue?.Value);
+    }
+}