Introduce nextPositionOf() for VisiblePosition

Source/core/editing/commands/ApplyBlockElementCommand.cpp

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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
@@ skipping 105 matching lines @@
         insertNodeAt(blockquote, start);
         RefPtrWillBeRawPtr<HTMLBRElement> placeholder = createBreakElement(document());
         appendNode(placeholder, blockquote);
         setEndingSelection(VisibleSelection(positionBeforeNode(placeholder.get()), TextAffinity::Downstream, endingSelection().isDirectional()));
         return;
     }
 
     RefPtrWillBeRawPtr<HTMLElement> blockquoteForNextIndent = nullptr;
     VisiblePosition endOfCurrentParagraph = endOfParagraph(startOfSelection);
     VisiblePosition endOfLastParagraph = endOfParagraph(endOfSelection);
-    VisiblePosition endAfterSelection = endOfParagraph(endOfLastParagraph.next());
+    VisiblePosition endAfterSelection = endOfParagraph(nextPositionOf(endOfLastParagraph));
     m_endOfLastParagraph = endOfLastParagraph.deepEquivalent();
 
     bool atEnd = false;
     Position end;
     while (endOfCurrentParagraph.deepEquivalent() != endAfterSelection.deepEquivalent() && !atEnd) {
         if (endOfCurrentParagraph.deepEquivalent() == m_endOfLastParagraph)
             atEnd = true;
 
         rangeForParagraphSplittingTextNodesIfNeeded(endOfCurrentParagraph, start, end);
         endOfCurrentParagraph = VisiblePosition(end);
@@ skipping 105 matching lines @@
                 else
                     m_endOfLastParagraph = Position(endContainer, m_endOfLastParagraph.offsetInContainerNode() - end.offsetInContainerNode());
             }
             end = lastPositionInNode(endContainer->previousSibling());
         }
     }
 }
 
 VisiblePosition ApplyBlockElementCommand::endOfNextParagrahSplittingTextNodesIfNeeded(VisiblePosition& endOfCurrentParagraph, Position& start, Position& end)
 {
-    VisiblePosition endOfNextParagraph = endOfParagraph(endOfCurrentParagraph.next());
+    VisiblePosition endOfNextParagraph = endOfParagraph(nextPositionOf(endOfCurrentParagraph));
     Position position = endOfNextParagraph.deepEquivalent();
     const ComputedStyle* style = computedStyleOfEnclosingTextNode(position);
     if (!style)
         return endOfNextParagraph;
 
     RefPtrWillBeRawPtr<Text> text = toText(position.computeContainerNode());
     if (!style->preserveNewline() || !position.offsetInContainerNode() || !isNewLineAtPosition(firstPositionInNode(text.get())))
         return endOfNextParagraph;
 
     // \n at the beginning of the text node immediately following the current paragraph is trimmed by moveParagraphWithClones.
@@ skipping 31 matching lines @@
     return element.release();
 }
 
 DEFINE_TRACE(ApplyBlockElementCommand)
 {
     visitor->trace(m_endOfLastParagraph);
     CompositeEditCommand::trace(visitor);
 }
 
 }