Avoid using cross RenderView selection rendering

Source/core/editing/FrameSelection.cpp

Index: Source/core/editing/FrameSelection.cpp
diff --git a/Source/core/editing/FrameSelection.cpp b/Source/core/editing/FrameSelection.cpp
index f2f39734097e4d0f606ca191c040efcde9d653d5..c592a8c6008170e3f0a454d3e52de08daf5cfb20 100644
--- a/Source/core/editing/FrameSelection.cpp
+++ b/Source/core/editing/FrameSelection.cpp
@@ -1586,7 +1586,8 @@ void FrameSelection::updateAppearance()
     if (startPos.isNotNull() && endPos.isNotNull() && selection.visibleStart() != selection.visibleEnd()) {
         RenderObject* startRenderer = startPos.deprecatedNode()->renderer();
         RenderObject* endRenderer = endPos.deprecatedNode()->renderer();
-        view->setSelection(startRenderer, startPos.deprecatedEditingOffset(), endRenderer, endPos.deprecatedEditingOffset());
+        if (startRenderer->view() == view && endRenderer->view() == view)

[Yuta Kitamura, 2014/04/14 06:23:40]

This line would probably deserve some comments because it's not very obvious
why we need these checks.

[yosin_UTC9, 2014/04/14 08:03:56]

Done.

+            view->setSelection(startRenderer, startPos.deprecatedEditingOffset(), endRenderer, endPos.deprecatedEditingOffset());
     }
 }