Make the compositing assert disabler for paint invalidation more targeted.

Source/core/editing/Caret.cpp

 /*
  * Copyright (C) 2004, 2008, 2009, 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/editing/Caret.h"
 
 #include "core/dom/Document.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/editing/htmlediting.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLTextFormControlElement.h"
 #include "core/rendering/RenderBlock.h"
+#include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderView.h"
 #include "platform/graphics/GraphicsContext.h"
 
 namespace blink {
 
 CaretBase::CaretBase(CaretVisibility visibility)
     : m_caretRectNeedsUpdate(true)
     , m_caretVisibility(visibility)
 {
 }
 
 DragCaretController::DragCaretController()
     : CaretBase(Visible)
 {
 }
 
 PassOwnPtrWillBeRawPtr<DragCaretController> DragCaretController::create()
 {
     return adoptPtrWillBeNoop(new DragCaretController);
 }
 
 bool DragCaretController::isContentRichlyEditable() const
 {
     return isRichlyEditablePosition(m_position.deepEquivalent());
 }
 
 void DragCaretController::setCaretPosition(const VisiblePosition& position)
 {
+    // for querying RenderLayer::compositingState()
+    // This code is probably correct, since it doesn't occur in a stack that involves updating compositing state.
+    DisableCompositingQueryAsserts disabler;
+
     if (Node* node = m_position.deepEquivalent().deprecatedNode())
         invalidateCaretRect(node);
     m_position = position;
     setCaretRectNeedsUpdate();
     Document* document = 0;
     if (Node* node = m_position.deepEquivalent().deprecatedNode()) {
         invalidateCaretRect(node);
         document = &node->document();
     }
     if (m_position.isNull() || m_position.isOrphan()) {
@@ skipping 194 matching lines @@
     context->fillRect(caret, caretColor);
 }
 
 void DragCaretController::paintDragCaret(LocalFrame* frame, GraphicsContext* p, const LayoutPoint& paintOffset, const LayoutRect& clipRect) const
 {
     if (m_position.deepEquivalent().deprecatedNode()->document().frame() == frame)
         paintCaret(m_position.deepEquivalent().deprecatedNode(), p, paintOffset, clipRect);
 }
 
 }