WebFrame::selectRange and moveCaret should behave like mouse selection

Source/core/editing/VisiblePosition.cpp

Index: Source/core/editing/VisiblePosition.cpp
diff --git a/Source/core/editing/VisiblePosition.cpp b/Source/core/editing/VisiblePosition.cpp
index 115309666004370cb14c669f280f4fc261d8b77d..da43c2f80ffa68922aae16a79a3bd33188d47c13 100644
--- a/Source/core/editing/VisiblePosition.cpp
+++ b/Source/core/editing/VisiblePosition.cpp
@@ -32,11 +32,13 @@
 #include "core/dom/Document.h"
 #include "core/dom/Range.h"
 #include "core/dom/Text.h"
+#include "core/editing/VisibleSelection.h"
 #include "core/editing/VisibleUnits.h"
 #include "core/editing/htmlediting.h"
 #include "core/html/HTMLElement.h"
 #include "core/platform/Logging.h"
 #include "core/platform/graphics/FloatQuad.h"
+#include "core/platform/graphics/LayoutPoint.h"
 #include "core/rendering/InlineTextBox.h"
 #include "core/rendering/RenderBlock.h"
 #include "core/rendering/RootInlineBox.h"
@@ -743,6 +745,26 @@ bool isLastVisiblePositionInNode(const VisiblePosition &visiblePosition, const N
     return next.isNull() || !next.deepEquivalent().deprecatedNode()->isDescendantOf(node);
 }
 
+VisiblePosition visiblePositionRespectingEditingBoundary(const VisibleSelection& currentSelection, const LayoutPoint& localPoint, Node* targetNode)
+{
+    LayoutPoint selectionEndPoint = localPoint;
+    Element* editableElement = currentSelection.rootEditableElement();
+
+    if (!targetNode->renderer())
+        return VisiblePosition();
+
+    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);
+}
+
 }  // namespace WebCore
 
 #ifndef NDEBUG