refactor(engine): extract progress reporting seam

OpenNest.Engine/Fill/IterativeShrinkFiller.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
+using OpenNest.Engine.Jobs.Placement.Fillers;
 using OpenNest.Geometry;
 
 namespace OpenNest.Engine.Fill
@@ -136,7 +137,7 @@ namespace OpenNest.Engine.Fill
                     var allParts = new List<Part>(placedSoFar.Count + best.Count);
                     allParts.AddRange(placedSoFar);
                     allParts.AddRange(best);
-                    NestEngineBase.ReportProgress(
+                    NestProgressReporter.Report(
                         progress,
                         new ProgressReport
                         {

OpenNest.Engine/Fill/ShrinkFiller.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
 using OpenNest.Geometry;
+using OpenNest.Engine.Jobs.Placement.Fillers;
 using OpenNest.Engine.RectanglePacking;
 
 namespace OpenNest.Engine.Fill
@@ -89,7 +90,7 @@ namespace OpenNest.Engine.Fill
 
             var desc = $"Shrink {axis}: {bestParts.Count} parts, dim={dim:F1}";
 
-            NestEngineBase.ReportProgress(
+            NestProgressReporter.Report(
                 progress,
                 new ProgressReport
                 {

OpenNest.Engine/Jobs/Placement/Fillers/NestProgressReporter.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+
+namespace OpenNest.Engine.Jobs.Placement.Fillers;
+
+internal static class NestProgressReporter
+{
+    internal static void Report(IProgress<NestProgress> progress, ProgressReport report)
+    {
+        if (progress == null || report.Parts == null || report.Parts.Count == 0)
+            return;
+
+        var clonedParts = new List<Part>(report.Parts.Count);
+        foreach (var part in report.Parts)
+            clonedParts.Add((Part)part.Clone());
+
+        Debug.WriteLine(
+            $"[Progress] Phase={report.Phase}, Plate={report.PlateNumber}, "
+                + $"Parts={clonedParts.Count} | {report.Description}"
+        );
+
+        progress.Report(
+            new NestProgress
+            {
+                Phase = report.Phase,
+                PlateNumber = report.PlateNumber,
+                BestParts = clonedParts,
+                Description = report.Description,
+                ActiveWorkArea = report.WorkArea,
+                IsOverallBest = report.IsOverallBest,
+            }
+        );
+    }
+}

OpenNest.Engine/NestEngineBase.cs

@@ -6,6 +6,7 @@ using System.Threading;
 using OpenNest.Engine;
 using OpenNest.Engine.BestFit;
 using OpenNest.Engine.Fill;
+using OpenNest.Engine.Jobs.Placement.Fillers;
 using OpenNest.Engine.Strategies;
 using OpenNest.Geometry;
 using OpenNest.Math;
@@ -261,29 +262,7 @@ namespace OpenNest.Engine
 
         internal static void ReportProgress(IProgress<NestProgress> progress, ProgressReport report)
         {
-            if (progress == null || report.Parts == null || report.Parts.Count == 0)
-                return;
-
-            var clonedParts = new List<Part>(report.Parts.Count);
-            foreach (var part in report.Parts)
-                clonedParts.Add((Part)part.Clone());
-
-            Debug.WriteLine(
-                $"[Progress] Phase={report.Phase}, Plate={report.PlateNumber}, "
-                    + $"Parts={clonedParts.Count} | {report.Description}"
-            );
-
-            progress.Report(
-                new NestProgress
-                {
-                    Phase = report.Phase,
-                    PlateNumber = report.PlateNumber,
-                    BestParts = clonedParts,
-                    Description = report.Description,
-                    ActiveWorkArea = report.WorkArea,
-                    IsOverallBest = report.IsOverallBest,
-                }
-            );
+            NestProgressReporter.Report(progress, report);
         }
 
         protected string BuildProgressSummary()

OpenNest.Engine/Strategies/FillContext.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Threading;
 using OpenNest.Engine;
 using OpenNest.Engine.Fill;
+using OpenNest.Engine.Jobs.Placement.Fillers;
 using OpenNest.Geometry;
 
 namespace OpenNest.Engine.Strategies
@@ -50,7 +51,7 @@ namespace OpenNest.Engine.Strategies
                 WinnerPhase = ActivePhase;
             }
 
-            NestEngineBase.ReportProgress(
+            NestProgressReporter.Report(
                 Progress,
                 new ProgressReport
                 {