Exclude OCG dictionaries from duplication verification

Add test case to verifie OCG copying behaviour

DEVSIX-6093

Author: glenn.volckaert

kernel/src/main/java/com/itextpdf/kernel/pdf/PdfWriter.java

@@ -285,7 +285,7 @@ protected PdfObject copyObject(PdfObject obj, PdfDocument documentTo, boolean al
         }
 
         SerializedObjectContent serializedContent = null;
-        if (properties.smartMode && tryToFindDuplicate && !checkTypeOfPdfDictionary(obj, PdfName.Page)) {
+        if (properties.smartMode && tryToFindDuplicate && !checkTypeOfPdfDictionary(obj, PdfName.Page) && !checkTypeOfPdfDictionary(obj, PdfName.OCG)) {
             serializedContent = smartModeSerializer.serializeObject(obj);
             PdfIndirectReference objectRef = smartModeSerializer.getSavedSerializedObject(serializedContent);
             if (objectRef != null) {

kernel/src/test/java/com/itextpdf/kernel/utils/PdfMergerTest.java

@@ -519,6 +519,27 @@ public void mergePdfDocumentsWithCopingOutlinesTest() throws IOException, Interr
         Assert.assertNull(new CompareTool().compareByContent(mergedDocument, cmpDocument, destinationFolder));
     }
 
+    @Test
+    public void MergeWithSameNamedOCGTest() throws IOException, InterruptedException {
+        String firstPdfDocument = sourceFolder + "sameNamdOCGSource.pdf";
+        String secondPdfDocument = sourceFolder + "doc2.pdf";
+        String cmpDocument = sourceFolder + "cmp_MergeWithSameNamedOCG.pdf";
+        String mergedDocument = destinationFolder + "mergeWithSameNamedOCG.pdf";
+
+        try (PdfDocument documentA = new PdfDocument(new PdfReader(firstPdfDocument));
+                PdfDocument documentB = new PdfDocument(new PdfReader(secondPdfDocument));
+                PdfDocument mergedPdf = new PdfDocument(new PdfWriter(mergedDocument))) {
+            mergedPdf.getWriter().setSmartMode(true);
+            PdfMerger merger = new PdfMerger(mergedPdf, false, true);
+            merger.merge(documentA, 1, documentA.getNumberOfPages());
+            merger.merge(documentB, 1, documentB.getNumberOfPages());
+
+            merger.close();
+        }
+
+        Assert.assertNull(new CompareTool().compareByContent(mergedDocument, cmpDocument, destinationFolder));
+    }
+
     private void mergePdfs(List<File> sources, String destination) throws IOException {
         PdfDocument mergedDoc = new PdfDocument(new PdfWriter(destination));
         PdfMerger merger = new PdfMerger(mergedDoc);