Fix duplicate bend-note rendering in CAD converter

OpenNest.Tests/Bending/CadBendNoteTests.cs

@@ -0,0 +1,47 @@
+using ACadSharp;
+using ACadSharp.Entities;
+using ACadSharp.Tables;
+using CSMath;
+using OpenNest.Bending;
+using OpenNest.Controls;
+using OpenNest.IO.Bending;
+
+namespace OpenNest.Tests.Bending;
+
+public class CadBendNoteTests
+{
+    [Fact]
+    public void DetectedNote_HidesOnlyItsSourceText_AndReturnsWhenBendRemoved()
+    {
+        var doc = new CadDocument();
+        doc.Entities.Add(new Line(new XYZ(0, 0, 0), new XYZ(10, 0, 0))
+        {
+            Layer = new Layer("BEND"),
+            LineType = new LineType("CENTER")
+        });
+        var note = new MText { Value = "UP 90° R0.125", InsertPoint = new XYZ(5, 0.1, 0), Height = 0.2 };
+        doc.Entities.Add(note);
+        var unrelated = new MText { Value = note.Value, InsertPoint = new XYZ(50, 50, 0), Height = 0.2 };
+        doc.Entities.Add(unrelated);
+
+        var bends = new SolidWorksBendDetector().DetectBends(doc);
+        var bend = Assert.Single(bends);
+        Assert.Equal(note.Handle, bend.SourceNoteHandle);
+        var text = new CadText { SourceHandle = note.Handle, Value = note.Value };
+        Assert.True(text.IsReplacedByBendNote(bends));
+        Assert.False(new CadText { SourceHandle = unrelated.Handle, Value = note.Value }.IsReplacedByBendNote(bends));
+
+        bends.Clear();
+        Assert.False(text.IsReplacedByBendNote(bends));
+    }
+
+    [Fact]
+    public void MissingSourceOrReplacement_DoesNotHideText()
+    {
+        var text = new CadText { SourceHandle = 42, Value = "UP 90° R0.125" };
+        Assert.False(text.IsReplacedByBendNote(null));
+        Assert.False(text.IsReplacedByBendNote(new[] { new Bend { NoteText = text.Value } }));
+        Assert.False(text.IsReplacedByBendNote(new[] { new Bend { SourceNoteHandle = 42 } }));
+        Assert.False(new CadText().IsReplacedByBendNote(new[] { new Bend { NoteText = text.Value } }));
+    }
+}

OpenNest.Tests/Bending/SolidWorksBendDetectorTests.cs

@@ -91,6 +91,9 @@ public class SolidWorksBendDetectorTests
         Assert.All(bends, b =>
         {
             Assert.NotNull(b.NoteText);
+            Assert.NotNull(b.SourceNoteHandle);
+            Assert.Contains(doc.Entities, e => e.Handle == b.SourceNoteHandle
+                && e is ACadSharp.Entities.MText);
             Assert.Equal(BendDirection.Up, b.Direction);
             Assert.Equal(90.0, b.Angle);
             Assert.Equal(0.125, b.Radius);