Refactor RenderQuote to not delete renderers on style change.

Source/core/rendering/RenderTextFragment.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 15 matching lines @@
 #include "core/dom/Text.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/RenderBlock.h"
 
 namespace blink {
 
 RenderTextFragment::RenderTextFragment(Node* node, StringImpl* str, int startOffset, int length)
     : RenderText(node, str ? str->substring(startOffset, length) : PassRefPtr<StringImpl>(nullptr))
     , m_start(startOffset)
     , m_end(length)
+    , m_contentString(str)
     , m_firstLetter(nullptr)
 {
 }
 
 RenderTextFragment::RenderTextFragment(Node* node, StringImpl* str)
     : RenderText(node, str)
     , m_start(0)
     , m_end(str ? str->length() : 0)
     , m_contentString(str)
     , m_firstLetter(nullptr)
@@ skipping 12 matching lines @@
 
 RenderText* RenderTextFragment::firstRenderTextInFirstLetter() const
 {
     for (RenderObject* current = m_firstLetter; current; current = current->nextInPreOrder(m_firstLetter)) {
         if (current->isText())
             return toRenderText(current);
     }
     return 0;
 }
 
+void RenderTextFragment::setContentString(StringImpl* str)
+{
+    m_contentString = str;
+    setText(str);
+}
+
 PassRefPtr<StringImpl> RenderTextFragment::originalText() const
 {
-    Node* e = node();
-    RefPtr<StringImpl> result = ((e && e->isTextNode()) ? toText(e)->dataImpl() : contentString());
+    RefPtr<StringImpl> result = RenderText::originalText();
+    if (!result)
+        result = m_contentString;
     if (!result)
         return nullptr;
     return result->substring(start(), end());
 }
 
 void RenderTextFragment::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
 {
     RenderText::styleDidChange(diff, oldStyle);
 
     if (RenderBlock* block = blockForAccompanyingFirstLetter()) {
@@ skipping 13 matching lines @@
 {
     RenderText::setText(text, force);
 
     m_start = 0;
     m_end = textLength();
     if (m_firstLetter) {
         // FIXME: We should not modify the structure of the render tree during
         // layout. crbug.com/370458
         DeprecatedDisableModifyRenderTreeStructureAsserts disabler;
 
-        ASSERT(!m_contentString);
         m_firstLetter->destroy();
         m_firstLetter = nullptr;
         if (Node* t = node()) {
             ASSERT(!t->renderer());
             t->setRenderer(this);
         }
     }
 }
 
 void RenderTextFragment::transformText()
 {
     // Don't reset first-letter here because we are only transforming the truncated fragment.
     if (RefPtr<StringImpl> textToTransform = originalText())
         RenderText::setText(textToTransform.release(), true);
 }
 
 UChar RenderTextFragment::previousCharacter() const
 {
     if (start()) {
-        Node* e = node();
-        StringImpl* original = ((e && e->isTextNode()) ? toText(e)->dataImpl() : contentString());
+        RefPtr<StringImpl> original = RenderText::originalText();
+        if (!original)
+            original =  m_contentString;
         if (original && start() <= original->length())
             return (*original)[start() - 1];
     }
 
     return RenderText::previousCharacter();
 }
 
 RenderBlock* RenderTextFragment::blockForAccompanyingFirstLetter() const
 {
     if (!m_firstLetter)
@@ skipping 15 matching lines @@
         return;
     RenderObject* nodeRenderer = node()->renderer();
     if (!nodeRenderer || !nodeRenderer->isText() || !toRenderText(nodeRenderer)->isTextFragment())
         return;
 
     if (isDescendantOf(toRenderTextFragment(nodeRenderer)->m_firstLetter))
         result.setIsFirstLetter(true);
 }
 
 } // namespace blink