sw: fix assertion on exporting novell633099-1.doc to DOC

This asserts because MarkManager::m_vAllMarks is not sorted.

info:sw.core:32273:1:sw/source/core/doc/docbm.cxx:286: 1493,39 1493,39 N2sw4mark8BookmarkE _Source_Device_Configuration
info:sw.core:32273:1:sw/source/core/doc/docbm.cxx:286: 1493,39 1493,39 N2sw4mark8BookmarkE _Deploying_the_Connector
info:sw.core:32273:1:sw/source/core/doc/docbm.cxx:286: 1493,39 1493,39 N2sw4mark8BookmarkE _Setting_up_Connection
info:sw.core:32273:1:sw/source/core/doc/docbm.cxx:286: 1493,39 1493,39 N2sw4mark8BookmarkE _Testing_the_Audit
info:sw.core:32273:1:sw/source/core/doc/docbm.cxx:286: 1493,0 1493,0 N2sw4mark23CrossRefHeadingBookmarkE __RefHeading___Toc270687978

This happens while called from SwRangeRedline::MoveFromSection; the
target paragraph has some normal bookmarks and a CrossRefBookmark
all at index 0 before, but the move messes up the sorting.

The reason is that SwIndexReg::Update() has a special case HACK to avoid
adjusting the content index of CrossRefBookmark away from 0.

Prevent the problem by tweaking the bookmark sort function to always
sort CrossRefBookmark before other marks in the paragraph.

Change-Id: I1373337a9c7e6760fdbe5b634a14c63428a2e73c

sw/source/core/doc/docbm.cxx

@@ -78,7 +78,21 @@ namespace
     bool lcl_MarkOrderingByStart(const IDocumentMarkAccess::pMark_t& rpFirst,
         const IDocumentMarkAccess::pMark_t& rpSecond)
     {
-        return rpFirst->GetMarkStart() < rpSecond->GetMarkStart();
+        auto const& rFirstStart(rpFirst->GetMarkStart());
+        auto const& rSecondStart(rpSecond->GetMarkStart());
+        if (rFirstStart.nNode != rSecondStart.nNode)
+        {
+            return rFirstStart.nNode < rSecondStart.nNode;
+        }
+        if (rFirstStart.nContent != 0 || rSecondStart.nContent != 0)
+        {
+            return rFirstStart.nContent < rSecondStart.nContent;
+        }
+        auto *const pCRFirst (dynamic_cast<::sw::mark::CrossRefBookmark const*>(rpFirst.get()));
+        auto *const pCRSecond(dynamic_cast<::sw::mark::CrossRefBookmark const*>(rpSecond.get()));
+        return ((pCRFirst == nullptr) == (pCRSecond == nullptr))
+                ? false // equal
+                : (pCRFirst != nullptr); // cross-ref sorts *before*
     }
 
     bool lcl_MarkOrderingByEnd(const IDocumentMarkAccess::pMark_t& rpFirst,