fix(core): charge removal time only for removed clamps on the sheet

Plate.ClampRemovalMinutes multiplied every listed removed id by the
removal time, including ids the rail places beyond the sheet after a resize
or does not know at all. Only removed clamps the rail resolves on this sheet
are pulled, so only those add time; the ids themselves stay listed (C13).

PM 6ded8ac4-84fd-4e8b-9a3b-6f41e494542c item (a)

OpenNest.Core/Plate.cs

@@ -155,11 +155,16 @@ namespace OpenNest
 
         /// <summary>
         /// Minutes this sheet's cut-time estimate gains from <see cref="RemovedClamps"/> (D9):
-        /// each listed clamp adds <see cref="OpenNest.ClampRail.RemovalMinutes"/> once. Zero
-        /// when there is no rail (removal is meaningless without one to remove clamps from).
+        /// each listed clamp the rail places on this sheet adds
+        /// <see cref="OpenNest.ClampRail.RemovalMinutes"/> once; a listed clamp that is beyond
+        /// the sheet (or unknown to the rail) is not pulled and costs nothing. Zero when there
+        /// is no rail (removal is meaningless without one to remove clamps from).
         /// </summary>
         public double ClampRemovalMinutes =>
-            ClampRail == null ? 0 : RemovedClamps.Count * ClampRail.RemovalMinutes;
+            ClampRail == null || RemovedClamps.Count == 0
+                ? 0
+                : ClampRail.ResolveFor(Size, Quadrant).Count(zone => RemovedClamps.Contains(zone.Id))
+                    * ClampRail.RemovalMinutes;
 
         /// <summary>
         /// Follows <paramref name="rail"/> and replaces the zones with its resolution for

OpenNest.Tests/ClampRailTests.cs

@@ -370,4 +370,16 @@ public class ClampRailTests
         Assert.False(Machine().Matches(plate, Array.Empty<string>()));
         Assert.False(Machine().Matches(plate, new[] { "clamp-4" }));
     }
+    // PM 6ded8ac4 (a): only removed clamps that are actually on this sheet cost time.
+    [Fact]
+    public void RemovalTimeCountsOnlyRemovedClampsOnTheSheet()
+    {
+        var plate = Sheet(48, 120);
+        plate.SetClampRail(Machine(), new[] { "clamp-3", "clamp-8", "clamp-99" });
+        Assert.Equal(2 * ClampRail.DefaultRemovalMinutes, plate.ClampRemovalMinutes); // 3 and 8
+
+        plate.Size = new Size(48, 60); // clamp-8 is now beyond the sheet
+        Assert.Equal(ClampRail.DefaultRemovalMinutes, plate.ClampRemovalMinutes);
+        Assert.Contains("clamp-8", plate.RemovedClamps); // still listed (C13)
+    }
 }