writer won't allow us to enter multiple CrossRefBookmarks on the same node

e.g. fdo63164-1.docx and loads more like that, and the .docx genuinely has
multiple bookmarks at the same place, so just allow the first one and discard
the following ones

Change-Id: Ida2f5d79fdef4ed3e2d8c1e96ca6a086004f6c7d

writerfilter/source/dmapper/DomainMapper_Impl.cxx

@@ -55,6 +55,7 @@
 #include <com/sun/star/text/XParagraphCursor.hpp>
 #include <com/sun/star/text/XRedline.hpp>
 #include <com/sun/star/text/XTextFieldsSupplier.hpp>
+#include <com/sun/star/text/XTextRangeCompare.hpp>
 #include <com/sun/star/style/DropCapFormat.hpp>
 #include <com/sun/star/util/NumberFormatter.hpp>
 #include <com/sun/star/util/XNumberFormatsSupplier.hpp>
@@ -4416,11 +4417,34 @@ void DomainMapper_Impl::StartOrEndBookmark( const OUString& rId )
                 {
                     xCursor->goLeft( 1, false );
                 }
+
                 uno::Reference< container::XNamed > xBkmNamed( xBookmark, uno::UNO_QUERY_THROW );
-                assert(!aBookmarkIter->second.m_sBookmarkName.isEmpty());
-                //todo: make sure the name is not used already!
-                xBkmNamed->setName( aBookmarkIter->second.m_sBookmarkName );
-                xTextAppend->insertTextContent( uno::Reference< text::XTextRange >( xCursor, uno::UNO_QUERY_THROW), xBookmark, !xCursor->isCollapsed() );
+
+                bool bAllowInsert = true;
+                uno::Reference<text::XTextRange> xRange(xCursor, uno::UNO_QUERY_THROW);
+                if (m_xPrevBookmark.is())
+                {
+                    fprintf(stderr, "ok here\n");
+                    uno::Reference<text::XTextRangeCompare> xTextRangeCompare(xRange->getText(), uno::UNO_QUERY_THROW);
+                    fprintf(stderr, "still ok here\n");
+
+                    if (xTextRangeCompare->compareRegionStarts(m_xPrevBookmark, xRange) == 0 &&
+                        xTextRangeCompare->compareRegionEnds(m_xPrevBookmark, xRange) == 0)
+                    {
+                        SAL_WARN("writerfilter", "Cannot insert bookmark " << aBookmarkIter->second.m_sBookmarkName
+                                                 << " because another one is already inserted at this point");
+                        bAllowInsert = false;
+                    }
+                }
+
+                if (bAllowInsert)
+                {
+                    assert(!aBookmarkIter->second.m_sBookmarkName.isEmpty());
+                    //todo: make sure the name is not used already!
+                    xBkmNamed->setName( aBookmarkIter->second.m_sBookmarkName );
+                    xTextAppend->insertTextContent(xRange, xBookmark, !xCursor->isCollapsed());
+                    m_xPrevBookmark = xRange;
+                }
             }
             m_aBookmarkMap.erase( aBookmarkIter );
             m_sCurrentBkmkId.clear();

writerfilter/source/dmapper/DomainMapper_Impl.hxx

@@ -349,6 +349,8 @@ private:
     LineNumberSettings                                                              m_aLineNumberSettings;
 
     BookmarkMap_t                                                                   m_aBookmarkMap;
+    /// Detect attempt to insert multiple bookmarks at the same position
+    css::uno::Reference<css::text::XTextRange>                                      m_xPrevBookmark;
     OUString                                                                        m_sCurrentBkmkId;
     OUString                                                                        m_sCurrentBkmkName;