Add test case, that test that we lower the object count

src/UglyToad.PdfPig.Tests/Writer/PdfMergerTests.cs

@@ -79,5 +79,21 @@
                 Assert.Equal(3, document.NumberOfPages);
             }
         }
+
+        [Fact]
+        public void ObjectCountLower()
+        {
+            var one = IntegrationHelpers.GetDocumentPath("Single Page Simple - from inkscape.pdf");
+            var two = IntegrationHelpers.GetDocumentPath("Single Page Simple - from inkscape.pdf");
+
+            var result = PdfMerger.Merge(one, two);
+
+            using (var document = PdfDocument.Open(result, ParsingOptions.LenientParsingOff))
+            {
+                Assert.Equal(2, document.NumberOfPages);
+                Assert.True(document.Structure.CrossReferenceTable.ObjectOffsets.Count < 24,
+                    "Expected object count to be lower than 24");
+            }
+        }
     }
 }