sw_redlinehide_4b: fix wrong handling of IsDelLastPara() redlines

CheckParaRedlineMerge(): Fully deleted SwTextNode followed by a table,
as seen in ooo81405-1.odt and ooo31961-16.sxw.

Also avoid creating an extent for the node in which it starts,
e.g. ooo31961-27.odt.

Change-Id: I2a7d935a9cedcb66aeaa9dce418b1fab758f1784

sw/source/core/text/itratr.cxx

@@ -740,6 +740,8 @@ TextFrameIndex SwAttrIter::GetNextAttr() const
             if (redline.second.first)
             {
                 assert(m_pMergedPara);
+                assert(redline.second.first->End()->nNode.GetIndex() <= m_pMergedPara->pLastNode->GetIndex()
+                    || !redline.second.first->End()->nNode.GetNode().IsTextNode());
                 if (CanSkipOverRedline(*redline.second.first,
                         nStartIndex, nEndIndex, m_nPosition == redline.first))
                 {   // if current position is start of the redline, must skip!

sw/source/core/text/redlnitr.cxx

@@ -124,12 +124,32 @@ CheckParaRedlineMerge(SwTextFrame & rFrame, SwTextNode & rTextNode,
                 }
                 pTmp->SetRedlineMergeFlag(SwNode::Merge::Hidden);
             }
-            pNode = pEnd->nNode.GetNode().GetTextNode();
-            assert(pNode);
-            nodes.push_back(pNode);
-            pNode->SetRedlineMergeFlag(SwNode::Merge::NonFirst);
+            // note: in DelLastPara() case, the end node is not actually merged
+            // and is likely a SwTableNode!
+            if (!pEnd->nNode.GetNode().IsTextNode())
+            {
+                assert(pEnd->nNode != pStart->nNode);
+                // must set pNode too because it will mark the last node
+                pNode = nodes.back();
+                assert(pNode == pNode->GetNodes()[pEnd->nNode.GetIndex() - 1]);
+                if (pNode != &rTextNode)
+                {   // something might depend on last merged one being NonFirst?
+                    pNode->SetRedlineMergeFlag(SwNode::Merge::NonFirst);
+                }
+                nLastEnd = pNode->Len();
+            }
+            else
+            {
+                pNode = pEnd->nNode.GetNode().GetTextNode();
+                nodes.push_back(pNode);
+                pNode->SetRedlineMergeFlag(SwNode::Merge::NonFirst);
+                nLastEnd = pEnd->nContent.GetIndex();
+            }
+        }
+        else
+        {
+            nLastEnd = pEnd->nContent.GetIndex();
         }
-        nLastEnd = pEnd->nContent.GetIndex();
     }
     if (pNode == &rTextNode)
     {