feat: consolidate legacy parity migration baseline

tests/MBN_STOCK_WEBVIEW.LegacyApplication.Tests/LegacyOperatorControllerTests.cs

@@ -539,6 +539,35 @@ public sealed class LegacyOperatorControllerTests
         Assert.Single(state.Playlist);
     }
 
+    [Fact]
+    public async Task PointerSelectionWithoutAppendPermission_NeverAppendsAndResetsDoubleClick()
+    {
+        var controller = new LegacyOperatorController(Lookup());
+        await controller.SearchStocksAsync("삼성", LegacySearchTrigger.Button);
+        controller.SelectStock(0);
+
+        controller.CutPointerDown(
+            1, false, false, 20, 45, 1_000, allowAppend: true);
+        var onAirSelection = controller.CutPointerDown(
+            1, false, false, 20, 45, 1_200, allowAppend: false);
+
+        Assert.Empty(onAirSelection.Playlist);
+        Assert.Equal(
+            1,
+            Assert.Single(onAirSelection.CutRows, row => row.IsSelected).PhysicalIndex);
+        Assert.Equal(
+            1,
+            Assert.Single(onAirSelection.CutRows, row => row.IsFocused).PhysicalIndex);
+
+        var firstIdleClick = controller.CutPointerDown(
+            1, false, false, 20, 45, 1_400, allowAppend: true);
+        Assert.Empty(firstIdleClick.Playlist);
+
+        var secondIdleClick = controller.CutPointerDown(
+            1, false, false, 20, 45, 1_600, allowAppend: true);
+        Assert.Single(secondIdleClick.Playlist);
+    }
+
     [Fact]
     public async Task DifferentPointerPosition_DoesNotCountAsLegacyDoubleClick()
     {