Make first-letter style to work with editing

Source/core/editing/VisibleUnits.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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 1116 matching lines @@
         if (style->visibility() != VISIBLE) {
             n = NodeTraversal::previousPostOrder(n, startBlock);
             continue;
         }
 
         if (r->isBR() || isBlock(n))
             break;
 
         if (r->isText() && toRenderText(r)->renderedTextLength()) {
             ASSERT_WITH_SECURITY_IMPLICATION(n->isTextNode());
+            RenderText* text = toRenderText(r);
             type = Position::PositionIsOffsetInAnchor;
             if (style->preserveNewline()) {
-                RenderText* text = toRenderText(r);
                 int i = text->textLength();
                 int o = offset;
                 if (n == startNode && o < i)
                     i = max(0, o);
                 while (--i >= 0) {
                     if ((*text)[i] == '\n')
-                        return VisiblePosition(Position(toText(n), i + 1), DOWNSTREAM);
+                        return VisiblePosition(Position(toText(n), i + text->textStartOffset() + 1), DOWNSTREAM);
                 }
             }
             node = n;
             offset = 0;
             n = NodeTraversal::previousPostOrder(n, startBlock);
         } else if (editingIgnoresContent(n) || isTableElement(n)) {
             node = n;
             type = Position::PositionIsBeforeAnchor;
             n = n->previousSibling() ? n->previousSibling() : NodeTraversal::previousPostOrder(n, startBlock);
         } else
@@ skipping 48 matching lines @@
             n = NodeTraversal::next(n, stayInsideBlock);
             continue;
         }
 
         if (r->isBR() || isBlock(n))
             break;
 
         // FIXME: We avoid returning a position where the renderer can't accept the caret.
         if (r->isText() && toRenderText(r)->renderedTextLength()) {
             ASSERT_WITH_SECURITY_IMPLICATION(n->isTextNode());
-            int length = toRenderText(r)->textLength();
+            RenderText* text = toRenderText(r);
+            int length = text->textLength();
             type = Position::PositionIsOffsetInAnchor;
             if (style->preserveNewline()) {
-                RenderText* text = toRenderText(r);
                 int o = n == startNode ? offset : 0;
                 for (int i = o; i < length; ++i) {
                     if ((*text)[i] == '\n')
-                        return VisiblePosition(Position(toText(n), i), DOWNSTREAM);
+                        return VisiblePosition(Position(toText(n), i + text->textStartOffset()), DOWNSTREAM);
                 }
             }
             node = n;
-            offset = r->caretMaxOffset();
+            offset = r->caretMaxOffset() + text->textStartOffset();
             n = NodeTraversal::next(n, stayInsideBlock);
         } else if (editingIgnoresContent(n) || isTableElement(n)) {
             node = n;
             type = Position::PositionIsAfterAnchor;
             n = NodeTraversal::nextSkippingChildren(n, stayInsideBlock);
         } else
             n = NodeTraversal::next(n, stayInsideBlock);
     }
 
     if (type == Position::PositionIsOffsetInAnchor)
@@ skipping 170 matching lines @@
 {
     return direction == LTR ? logicalStartOfLine(c) : logicalEndOfLine(c);
 }
 
 VisiblePosition rightBoundaryOfLine(const VisiblePosition& c, TextDirection direction)
 {
     return direction == LTR ? logicalEndOfLine(c) : logicalStartOfLine(c);
 }
 
 }