Implement retail character management screen

tests/AcDream.App.Tests/UI/UiButtonTests.cs

@@ -30,6 +30,29 @@ public class UiButtonTests
         Assert.Equal((17, 9), clicked);
     }
 
+    [Fact]
+    public void DoubleClick_IsOptInAndDisabledButtonsSwallowWithoutInvoking()
+    {
+        int activations = 0;
+        var button = new UiButton(
+            new ElementInfo { Type = 1, Width = 46, Height = 18 },
+            NoTex);
+        var doubleClick = new UiEvent(
+            0,
+            button,
+            UiEventType.DoubleClick);
+
+        Assert.False(button.OnEvent(doubleClick));
+
+        button.OnDoubleClick = () => activations++;
+        Assert.True(button.OnEvent(doubleClick));
+        Assert.Equal(1, activations);
+
+        button.Enabled = false;
+        Assert.True(button.OnEvent(doubleClick));
+        Assert.Equal(1, activations);
+    }
+
     [Fact]
     public void PointerDownAndUp_InvokeDistinctTransitionHandlers()
     {