Introduce nextPositionOf() for VisiblePosition

Source/core/editing/commands/InsertListCommand.cpp

 /*
  * Copyright (C) 2006, 2010 Apple 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 276 matching lines @@
     ASSERT(listChildNode);
     if (isHTMLLIElement(*listChildNode)) {
         start = VisiblePosition(firstPositionInNode(listChildNode));
         end = VisiblePosition(lastPositionInNode(listChildNode));
         nextListChild = listChildNode->nextSibling();
         previousListChild = listChildNode->previousSibling();
     } else {
         // A paragraph is visually a list item minus a list marker.  The paragraph will be moved.
         start = startOfParagraph(originalStart, CanSkipOverEditingBoundary);
         end = endOfParagraph(start, CanSkipOverEditingBoundary);
-        nextListChild = enclosingListChild(end.next().deepEquivalent().anchorNode(), listElement);
+        nextListChild = enclosingListChild(nextPositionOf(end).deepEquivalent().anchorNode(), listElement);
         ASSERT(nextListChild != listChildNode);
         previousListChild = enclosingListChild(previousPositionOf(start).deepEquivalent().anchorNode(), listElement);
         ASSERT(previousListChild != listChildNode);
     }
     // When removing a list, we must always create a placeholder to act as a point of insertion
     // for the list content being removed.
     RefPtrWillBeRawPtr<HTMLBRElement> placeholder = createBreakElement(document());
     RefPtrWillBeRawPtr<HTMLElement> elementToInsert = placeholder;
     // If the content of the list item will be moved into another list, put it in a list item
     // so that we don't create an orphaned list child.
@@ skipping 55 matching lines @@
     if (start.isNull() || end.isNull())
         return nullptr;
 
     // Check for adjoining lists.
     RefPtrWillBeRawPtr<HTMLElement> listItemElement = createListItemElement(document());
     RefPtrWillBeRawPtr<HTMLBRElement> placeholder = createBreakElement(document());
     appendNode(placeholder, listItemElement);
 
     // Place list item into adjoining lists.
     HTMLElement* previousList = adjacentEnclosingList(start, previousPositionOf(start, CannotCrossEditingBoundary), listTag);
-    HTMLElement* nextList = adjacentEnclosingList(start, end.next(CannotCrossEditingBoundary), listTag);
+    HTMLElement* nextList = adjacentEnclosingList(start, nextPositionOf(end, CannotCrossEditingBoundary), listTag);
     RefPtrWillBeRawPtr<HTMLElement> listElement = nullptr;
     if (previousList) {
         appendNode(listItemElement, previousList);
     } else if (nextList) {
         insertNodeAt(listItemElement, positionBeforeNode(nextList));
     } else {
         // Create the list.
         listElement = createHTMLElement(document(), listTag);
         appendNode(listItemElement, listElement);
 
@@ skipping 43 matching lines @@
     return listElement;
 }
 
 DEFINE_TRACE(InsertListCommand)
 {
     visitor->trace(m_listElement);
     CompositeEditCommand::trace(visitor);
 }
 
 }