fix(dock): address reviewer feedback on drag-and-drop highlighting

src/Test/Ghost.UnitTest/DockLayoutTest.cs

@@ -0,0 +1,62 @@
+using Ghost.Editor.View.Controls;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Ghost.UnitTest;
+
+[TestClass]
+public class DockLayoutTest
+{
+    private const double THRESHOLD = 0.25;
+
+    [TestMethod]
+    public void TestCalculateDockPosition_Center()
+    {
+        // 100x100, threshold 0.25 -> Center is [25, 75]
+        var pos = DockLayout.CalculateDockPosition(100, 100, 50, 50, THRESHOLD);
+        Assert.AreEqual(DockLayout.DockPosition.Center, pos);
+    }
+
+    [TestMethod]
+    public void TestCalculateDockPosition_Left()
+    {
+        var pos = DockLayout.CalculateDockPosition(100, 100, 10, 50, THRESHOLD);
+        Assert.AreEqual(DockLayout.DockPosition.Left, pos);
+    }
+
+    [TestMethod]
+    public void TestCalculateDockPosition_Right()
+    {
+        var pos = DockLayout.CalculateDockPosition(100, 100, 90, 50, THRESHOLD);
+        Assert.AreEqual(DockLayout.DockPosition.Right, pos);
+    }
+
+    [TestMethod]
+    public void TestCalculateDockPosition_Top()
+    {
+        var pos = DockLayout.CalculateDockPosition(100, 100, 50, 10, THRESHOLD);
+        Assert.AreEqual(DockLayout.DockPosition.Top, pos);
+    }
+
+    [TestMethod]
+    public void TestCalculateDockPosition_Bottom()
+    {
+        var pos = DockLayout.CalculateDockPosition(100, 100, 50, 90, THRESHOLD);
+        Assert.AreEqual(DockLayout.DockPosition.Bottom, pos);
+    }
+
+    [TestMethod]
+    public void TestCalculateDockPosition_CornerPrecedence_LeftTop()
+    {
+        // (10, 10) is in both Left and Top zones.
+        // Current implementation: Left/Right win over Top/Bottom.
+        var pos = DockLayout.CalculateDockPosition(100, 100, 10, 10, THRESHOLD);
+        Assert.AreEqual(DockLayout.DockPosition.Left, pos);
+    }
+
+    [TestMethod]
+    public void TestCalculateDockPosition_CornerPrecedence_RightBottom()
+    {
+        var pos = DockLayout.CalculateDockPosition(100, 100, 90, 90, THRESHOLD);
+        Assert.AreEqual(DockLayout.DockPosition.Right, pos);
+    }
+}

src/Test/Ghost.UnitTest/Ghost.UnitTest.csproj

@@ -16,6 +16,7 @@
 
   <ItemGroup>
     <ProjectReference Include="..\..\Editor\Ghost.Editor.Core\Ghost.Editor.Core.csproj" />
+    <ProjectReference Include="..\..\Editor\Ghost.Editor\Ghost.Editor.csproj" />
   </ItemGroup>
 
   <ItemGroup>