Merging in smartmode acroform inconsistencies

DEVSIX-830

Author: pavel-morozov-duallab

forms/src/main/java/com/itextpdf/forms/PdfPageFormCopier.java

@@ -202,7 +202,10 @@ private PdfFormField mergeFieldsWithTheSameName(PdfFormField existingField, PdfF
         }
 
         mergedField.addKid(existingField).addKid(newField);
-        mergedField.put(PdfName.V, existingField.getPdfObject().get(PdfName.V));
+        PdfObject value = existingField.getValue();
+        if (value != null) {
+            mergedField.put(PdfName.V, existingField.getPdfObject().get(PdfName.V));
+        }
 
         return mergedField;
     }

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

@@ -283,13 +283,21 @@ protected PdfObject copyObject(PdfObject obj, PdfDocument document, boolean allo
 
         int copyObjectKey = 0;
         boolean tryToFindDuplicate = !allowDuplicating && indirectReference != null;
+
         if (tryToFindDuplicate) {
             copyObjectKey = calculateIndRefKey(indirectReference);
             PdfIndirectReference copiedIndirectReference = copiedObjects.get(copyObjectKey);
             if (copiedIndirectReference != null)
                 return copiedIndirectReference.getRefersTo();
         }
 
+        if (obj.isDictionary()) {
+            PdfName subtype = ((PdfDictionary)obj).getAsName(PdfName.Subtype);
+            if (subtype != null && subtype.equals(PdfName.Widget)) {
+                tryToFindDuplicate = false;
+            }
+
+        }
         if (properties.smartMode && tryToFindDuplicate && !checkTypeOfPdfDictionary(obj, PdfName.Page)) {
             PdfIndirectReference copiedObjectRef = tryToFindPreviouslyCopiedEqualObject(obj);
             if (copiedObjectRef != null) {