fdo#37156 insert table copy as nested table in non-starting cell position

Inserted table content overwrote full cell content, when it was inserted
in the middle of a multi-paragraph table cell. Now overwriting
depends from the cursor position within the cell: if the cursor is not
at the beginning of the first paragraph of the cell, Writer
inserts the copied table content as a nested table, instead of
overwriting the cell (or also the other cells of the destination).

Change-Id: I1f993cfa65cf5936da245b39108162c15b3ff571

sw/source/core/frmedt/fecopy.cxx

@@ -818,7 +818,12 @@ bool SwFEShell::Paste( SwDoc* pClpDoc, bool bIncludingPageFrames )
         {
 
             if( pSrcNd &&
-                0 != ( pDestNd = GetDoc()->IsIdxInTbl( rPaM.GetPoint()->nNode )))
+                0 != ( pDestNd = GetDoc()->IsIdxInTbl( rPaM.GetPoint()->nNode )) &&
+                // are we at the beginning of the cell? (if not, we will insert a nested table)
+                // first paragraph of the cell?
+                rPaM.GetNode().GetIndex() == rPaM.GetNode().FindTableBoxStartNode()->GetIndex()+1 &&
+                // beginning of the paragraph?
+                !rPaM.GetPoint()->nContent.GetIndex())
             {
                 SwPosition aDestPos( *rPaM.GetPoint() );