Introduce enum class TextAffinity as replacement of enum EAffinity

Source/core/editing/commands/TypingCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2007, 2008 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 384 matching lines @@
             // If there is a single child and it could be a placeholder, leave it alone.
             if (root->layoutObject() && root->layoutObject()->isLayoutBlockFlow())
                 return false;
         }
     }
 
     while (Node* child = root->firstChild())
         removeNode(child);
 
     addBlockPlaceholderIfNeeded(root);
-    setEndingSelection(VisibleSelection(firstPositionInNode(root), DOWNSTREAM, endingSelection().isDirectional()));
+    setEndingSelection(VisibleSelection(firstPositionInNode(root), TextAffinity::Downstream, endingSelection().isDirectional()));
 
     return true;
 }
 
 void TypingCommand::deleteKeyPressed(TextGranularity granularity, bool killRing)
 {
     LocalFrame* frame = document().frame();
     if (!frame)
         return;
 
@@ skipping 42 matching lines @@
 
         // If the caret is at the start of a paragraph after a table, move content into the last table cell.
         if (isStartOfParagraph(visibleStart) && isFirstPositionAfterTable(visibleStart.previous(CannotCrossEditingBoundary))) {
             // Unless the caret is just before a table.  We don't want to move a table into the last table cell.
             if (isLastPositionBeforeTable(visibleStart))
                 return;
             // Extend the selection backward into the last cell, then deletion will handle the move.
             selection->modify(FrameSelection::AlterationExtend, DirectionBackward, granularity);
         // If the caret is just after a table, select the table and don't delete anything.
         } else if (Element* table = isFirstPositionAfterTable(visibleStart)) {
-            setEndingSelection(VisibleSelection(positionBeforeNode(table), endingSelection().start(), DOWNSTREAM, endingSelection().isDirectional()));
+            setEndingSelection(VisibleSelection(positionBeforeNode(table), endingSelection().start(), TextAffinity::Downstream, endingSelection().isDirectional()));
             typingAddedToOpenCommand(DeleteKey);
             return;
         }
 
         selectionToDelete = selection->selection();
 
         if (granularity == CharacterGranularity && selectionToDelete.end().computeContainerNode() == selectionToDelete.start().computeContainerNode()
             && selectionToDelete.end().computeOffsetInContainerNode() - selectionToDelete.start().computeOffsetInContainerNode() > 1) {
             // If there are multiple Unicode code points to be deleted, adjust the range to match platform conventions.
             selectionToDelete.setWithoutValidation(selectionToDelete.end(), selectionToDelete.end().previous(BackwardDeletion));
@@ skipping 63 matching lines @@
 
         Position downstreamEnd = endingSelection().end().downstream();
         VisiblePosition visibleEnd = endingSelection().visibleEnd();
         Node* enclosingTableCell = enclosingNodeOfType(visibleEnd.deepEquivalent(), &isTableCell);
         if (enclosingTableCell && visibleEnd.deepEquivalent() == VisiblePosition(lastPositionInNode(enclosingTableCell)).deepEquivalent())
             return;
         if (visibleEnd.deepEquivalent() == endOfParagraph(visibleEnd).deepEquivalent())
             downstreamEnd = visibleEnd.next(CannotCrossEditingBoundary).deepEquivalent().downstream();
         // When deleting tables: Select the table first, then perform the deletion
         if (isRenderedTableElement(downstreamEnd.computeContainerNode()) && downstreamEnd.computeOffsetInContainerNode() <= caretMinOffset(downstreamEnd.computeContainerNode())) {
-            setEndingSelection(VisibleSelection(endingSelection().end(), positionAfterNode(downstreamEnd.computeContainerNode()), DOWNSTREAM, endingSelection().isDirectional()));
+            setEndingSelection(VisibleSelection(endingSelection().end(), positionAfterNode(downstreamEnd.computeContainerNode()), TextAffinity::Downstream, endingSelection().isDirectional()));
             typingAddedToOpenCommand(ForwardDeleteKey);
             return;
         }
 
         // deleting to end of paragraph when at end of paragraph needs to merge the next paragraph (if any)
         if (granularity == ParagraphBoundary && selection->selection().isCaret() && isEndOfParagraph(selection->selection().visibleEnd()))
             selection->modify(FrameSelection::AlterationExtend, DirectionForward, CharacterGranularity);
 
         selectionToDelete = selection->selection();
         if (!startingSelection().isRange() || selectionToDelete.base() != startingSelection().start()) {
@@ skipping 63 matching lines @@
     ASSERT_NOT_REACHED();
     m_preservesTypingStyle = false;
 }
 
 bool TypingCommand::isTypingCommand() const
 {
     return true;
 }
 
 } // namespace blink