sw: fix insertion of hyperlink inside hyperlink...

... when either the start or the end position of the new hint is equal
to an existing hint.  There is not just 1 case here but 3 different
ones; don't attempt to insert hints with start > end.

Change-Id: I39cf8a352f67d77b56b0d01de5872f4d341f6bdd

sw/qa/complex/writer/TextPortionEnumerationTest.java

@@ -2051,6 +2051,29 @@ public class TextPortionEnumerationTest
 // this one gets eaten, but we still need to test inserting it (#i106930#)
 //            .appendChild( url6.dup().appendChild( new TextNode("") ) )
             .appendChild( new TextNode("89") );
+        // inside (left-edge)
+        TreeNode url7 = new HyperlinkNode( mkName("url") );
+        inserter.insertRange( new Range(0, 1, url7) );
+        root = new TreeNode()
+            .appendChild( url7.dup().appendChild( new TextNode("1") ) )
+            .appendChild( url2.dup().appendChild( new TextNode("2") ) )
+            .appendChild( url1.dup().appendChild( new TextNode("3") ) )
+            .appendChild( url4.dup().appendChild( new TextNode("4") ) )
+            .appendChild( url5.dup().appendChild( new TextNode("56") ) )
+            .appendChild( url4.dup().appendChild( new TextNode("7") ) )
+            .appendChild( new TextNode("89") );
+        // inside (right-edge)
+        TreeNode url8 = new HyperlinkNode( mkName("url") );
+        inserter.insertRange( new Range(5, 6, url8) );
+        root = new TreeNode()
+            .appendChild( url7.dup().appendChild( new TextNode("1") ) )
+            .appendChild( url2.dup().appendChild( new TextNode("2") ) )
+            .appendChild( url1.dup().appendChild( new TextNode("3") ) )
+            .appendChild( url4.dup().appendChild( new TextNode("4") ) )
+            .appendChild( url5.dup().appendChild( new TextNode("5") ) )
+            .appendChild( url8.dup().appendChild( new TextNode("6") ) )
+            .appendChild( url4.dup().appendChild( new TextNode("7") ) )
+            .appendChild( new TextNode("89") );
         doTest(root, false);
     }
 

sw/source/core/txtnode/thints.cxx

@@ -550,23 +550,31 @@ SwpHints::TryInsertNesting( SwTxtNode & rNode, SwTxtAttrNesting & rNewHint )
         }
         else
         {
-           assert((nOtherStart < nNewStart) && (nNewEnd < nOtherEnd));
+           assert((nOtherStart < nNewStart) || (nNewEnd < nOtherEnd));
         // scenario: there is a RUBY, and contained within that a META;
         // now a RUBY is inserted within the META => the exising RUBY is split:
         // here it is not possible to simply insert the left/right fragment
         // of the existing RUBY because they <em>overlap</em> with the META!
             Delete( *itOther ); // this also does NoteInHistory!
-            *(*itOther)->GetEnd() = nNewStart;
-            bool bSuccess( TryInsertNesting(rNode, **itOther) );
-            OSL_ENSURE(bSuccess, "recursive call 1 failed?");
-            SwTxtAttrNesting * const pOtherRight(
-                MakeTxtAttrNesting(
-                    rNode, **itOther, nNewEnd, nOtherEnd ) );
-            bSuccess = TryInsertNesting(rNode, *pOtherRight);
-            OSL_ENSURE(bSuccess, "recursive call 2 failed?");
-            (void)bSuccess;
+            if (nNewEnd < nOtherEnd)
+            {
+                SwTxtAttrNesting * const pOtherRight(
+                    MakeTxtAttrNesting(
+                        rNode, **itOther, nNewEnd, nOtherEnd ) );
+                bool const bSuccess( TryInsertNesting(rNode, *pOtherRight) );
+                SAL_WARN_IF(!bSuccess, "sw.core", "recursive call 1 failed?");
+            }
+            if (nOtherStart < nNewStart)
+            {
+                *(*itOther)->GetEnd() = nNewStart;
+                bool const bSuccess( TryInsertNesting(rNode, **itOther) );
+                SAL_WARN_IF(!bSuccess, "sw.core", "recursive call 2 failed?");
+            }
+            else
+            {
+                rNode.DestroyAttr(*itOther);
+            }
         }
-
     }
 
     return true;