Fix when bodyElements contain sdt, the inserted element is in the wrong position

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1906225 13f79535-47bb-0310-9956-ffa450edef68

poi-ooxml/src/main/java/org/apache/poi/xwpf/usermodel/XWPFDocument.java

@@ -842,7 +842,7 @@ public class XWPFDocument extends POIXMLDocument implements Document, IBody {
             cursor.toCursor(newParaPos);
             while (cursor.toPrevSibling()) {
                 o = cursor.getObject();
-                if (o instanceof CTP || o instanceof CTTbl) {
+                if (o instanceof CTP || o instanceof CTTbl || o instanceof CTSdtBlock) {
                     i++;
                 }
             }

poi-ooxml/src/test/java/org/apache/poi/xwpf/usermodel/TestXWPFDocument.java

@@ -464,6 +464,22 @@ public final class TestXWPFDocument {
         }
     }
 
+    @Test
+    void testInsertNewParagraphWithSdt() throws IOException {
+        try (XWPFDocument doc = new XWPFDocument()) {
+            doc.createTOC();
+            doc.createParagraph();
+            try (XWPFDocument docx = XWPFTestDataSamples.writeOutAndReadBack(doc)) {
+                XWPFParagraph paragraph = docx.getParagraphArray(0);
+                XmlCursor xmlCursor = paragraph.getCTP().newCursor();
+                XWPFParagraph insertNewParagraph = docx.insertNewParagraph(xmlCursor);
+
+                assertEquals(insertNewParagraph, docx.getParagraphs().get(0));
+                assertEquals(insertNewParagraph, docx.getBodyElements().get(1));
+            }
+        }
+    }
+
     @Test
     @Disabled("XWPF should be able to write to a new Stream when opened Read-Only")
     void testWriteFromReadOnlyOPC() throws Exception {