Use tighter typing in editing/

Source/core/editing/VisibleSelection.cpp

 /*
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 570 matching lines @@
     }
 
     ASSERT(m_start.anchorNode()->treeScope() == m_end.anchorNode()->treeScope());
 }
 
 void VisibleSelection::adjustSelectionToAvoidCrossingEditingBoundaries()
 {
     if (m_base.isNull() || m_start.isNull() || m_end.isNull())
         return;
 
-    Node* baseRoot = highestEditableRoot(m_base);
-    Node* startRoot = highestEditableRoot(m_start);
-    Node* endRoot = highestEditableRoot(m_end);
+    ContainerNode* baseRoot = highestEditableRoot(m_base);
+    ContainerNode* startRoot = highestEditableRoot(m_start);
+    ContainerNode* endRoot = highestEditableRoot(m_end);
 
-    Node* baseEditableAncestor = lowestEditableAncestor(m_base.containerNode());
+    Element* baseEditableAncestor = lowestEditableAncestor(m_base.containerNode());
 
     // The base, start and end are all in the same region.  No adjustment necessary.
     if (baseRoot == startRoot && baseRoot == endRoot)
         return;
 
     // The selection is based in editable content.
     if (baseRoot) {
         // If the start is outside the base's editable root, cap it at the start of that root.
         // If the start is in non-editable content that is inside the base's editable root, put it
         // at the first editable position after start inside the base's editable root.
@@ skipping 14 matching lines @@
             if (m_end.isNull())
                 m_end = m_start;
         }
     // The selection is based in non-editable content.
     } else {
         // FIXME: Non-editable pieces inside editable content should be atomic, in the same way that editable
         // pieces in non-editable content are atomic.
 
         // The selection ends in editable content or non-editable content inside a different editable ancestor,
         // move backward until non-editable content inside the same lowest editable ancestor is reached.
-        Node* endEditableAncestor = lowestEditableAncestor(m_end.containerNode());
+        Element* endEditableAncestor = lowestEditableAncestor(m_end.containerNode());
         if (endRoot || endEditableAncestor != baseEditableAncestor) {
 
             Position p = previousVisuallyDistinctCandidate(m_end);
             Node* shadowAncestor = endRoot ? endRoot->shadowHost() : 0;
             if (p.isNull() && shadowAncestor)
                 p = positionAfterNode(shadowAncestor);
             while (p.isNotNull() && !(lowestEditableAncestor(p.containerNode()) == baseEditableAncestor && !isEditablePosition(p))) {
                 Node* root = editableRootForPosition(p);
                 shadowAncestor = root ? root->shadowHost() : 0;
                 p = isAtomicNode(p.containerNode()) ? positionInParentBeforeNode(*p.containerNode()) : previousVisuallyDistinctCandidate(p);
                 if (p.isNull() && shadowAncestor)
                     p = positionAfterNode(shadowAncestor);
             }
             VisiblePosition previous(p);
 
             if (previous.isNull()) {
                 // The selection crosses an Editing boundary.  This is a
                 // programmer error in the editing code.  Happy debugging!
                 ASSERT_NOT_REACHED();
                 m_base = Position();
                 m_extent = Position();
                 validate();
                 return;
             }
             m_end = previous.deepEquivalent();
         }
 
         // The selection starts in editable content or non-editable content inside a different editable ancestor,
         // move forward until non-editable content inside the same lowest editable ancestor is reached.
-        Node* startEditableAncestor = lowestEditableAncestor(m_start.containerNode());
+        Element* startEditableAncestor = lowestEditableAncestor(m_start.containerNode());
         if (startRoot || startEditableAncestor != baseEditableAncestor) {
             Position p = nextVisuallyDistinctCandidate(m_start);
             Node* shadowAncestor = startRoot ? startRoot->shadowHost() : 0;
             if (p.isNull() && shadowAncestor)
                 p = positionBeforeNode(shadowAncestor);
             while (p.isNotNull() && !(lowestEditableAncestor(p.containerNode()) == baseEditableAncestor && !isEditablePosition(p))) {
                 Node* root = editableRootForPosition(p);
                 shadowAncestor = root ? root->shadowHost() : 0;
                 p = isAtomicNode(p.containerNode()) ? positionInParentAfterNode(*p.containerNode()) : nextVisuallyDistinctCandidate(p);
                 if (p.isNull() && shadowAncestor)
@@ skipping 186 matching lines @@
     sel.showTreeForThis();
 }
 
 void showTree(const blink::VisibleSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
 }
 
 #endif