WebFrame::selectRange and moveCaret should behave like mouse selection

Source/core/editing/VisibleSelection.cpp

Index: Source/core/editing/VisibleSelection.cpp
diff --git a/Source/core/editing/VisibleSelection.cpp b/Source/core/editing/VisibleSelection.cpp
index 09b7ab7ef2b845fbdccc2a40e1b2b558cd176c04..c5e98849878b0a206d0566ebf0f30b0f16918987 100644
--- a/Source/core/editing/VisibleSelection.cpp
+++ b/Source/core/editing/VisibleSelection.cpp
@@ -34,6 +34,8 @@
 #include "core/editing/VisiblePosition.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/editing/htmlediting.h"
+#include "core/platform/graphics/LayoutPoint.h"
+#include "core/rendering/RenderObject.h"
 #include <wtf/Assertions.h>
 #include <wtf/text/CString.h>
 #include <wtf/text/StringBuilder.h>
@@ -624,6 +626,27 @@ void VisibleSelection::adjustSelectionToAvoidCrossingEditingBoundaries()
         m_extent = m_baseIsFirst ? m_end : m_start;
 }
 
+VisiblePosition VisibleSelection::visiblePositionRespectingEditingBoundary(const LayoutPoint& localPoint, Node* targetNode) const
+{
+    if (!targetNode->renderer())
+        return VisiblePosition();
+
+    LayoutPoint selectionEndPoint = localPoint;
+    Element* editableElement = rootEditableElement();
+
+    if (editableElement && !editableElement->contains(targetNode)) {
+        if (!editableElement->renderer())
+            return VisiblePosition();
+
+        FloatPoint absolutePoint = targetNode->renderer()->localToAbsolute(FloatPoint(selectionEndPoint));
+        selectionEndPoint = roundedLayoutPoint(editableElement->renderer()->absoluteToLocal(absolutePoint));
+        targetNode = editableElement;
+    }
+
+    return targetNode->renderer()->positionForPoint(selectionEndPoint);
+}
+
+
 bool VisibleSelection::isContentEditable() const
 {
     return isEditablePosition(start());