Change caret to show language direction

Source/core/editing/Caret.cpp

Index: Source/core/editing/Caret.cpp
diff --git a/Source/core/editing/Caret.cpp b/Source/core/editing/Caret.cpp
index 2b3c1d6ccf2ebb25d5d785e3293dcadc09b02066..fb7e9c47681ae4186ffce7369740fa3274d5db3e 100644
--- a/Source/core/editing/Caret.cpp
+++ b/Source/core/editing/Caret.cpp
@@ -179,6 +179,18 @@ IntRect CaretBase::absoluteBoundsForLocalRect(Node* node, const LayoutRect& rect
     return caretPainter->localToAbsoluteQuad(FloatRect(localRect)).enclosingBoundingBox();
 }
 
+void CaretBase::updateDirectionPointer(const RenderObject* renderObject, LayoutRect& rect)
+{
+    if (!renderObject)
+        return;
+
+    // Extra rect are drawn, need to refresh more area.
+    TextDirection containerDirection = renderObject->style()->direction();
+    rect.setWidth(rect.width() + LayoutUnit(2));
+    if (containerDirection  == RTL)
+        rect.setX(rect.x() - LayoutUnit(2));
+}
+
 void CaretBase::repaintCaretForLocalRect(Node* node, const LayoutRect& rect)
 {
     RenderObject* caretPainter = caretRenderer(node);
@@ -190,6 +202,7 @@ void CaretBase::repaintCaretForLocalRect(Node* node, const LayoutRect& rect)
     LayoutRect inflatedRect = rect;
     inflatedRect.inflate(1);
 
+    updateDirectionPointer(caretPainter, inflatedRect);
     caretPainter->repaintRectangle(inflatedRect);
 }
 
@@ -223,8 +236,11 @@ void CaretBase::invalidateCaretRect(Node* node, bool caretRectChanged)
         return;
 
     if (RenderView* view = node->document().renderView()) {
-        if (shouldRepaintCaret(view, node->isContentEditable(Node::UserSelectAllIsAlwaysNonEditable)))
-            repaintCaretForLocalRect(node, localCaretRectWithoutUpdate());
+        if (shouldRepaintCaret(view, node->isContentEditable(Node::UserSelectAllIsAlwaysNonEditable))) {
+            LayoutRect drawingRect = localCaretRectWithoutUpdate();
+            updateDirectionPointer(caretRenderer(node), drawingRect);
+            repaintCaretForLocalRect(node, drawingRect);
+        }
     }
 }
 
@@ -242,6 +258,18 @@ void CaretBase::paintCaret(Node* node, GraphicsContext* context, const LayoutPoi
     if (caret.isEmpty())
         return;
 
+    TextDirection containerDirection = toRenderBoxModelObject(renderer)->style()->direction();
+    LayoutRect directionPointerCaret = caret;
+
+    // Drawing different Caret which shows editing style similar to IE.
+    if (containerDirection == LTR)
+        directionPointerCaret.setX(directionPointerCaret.x() + 1);
+    else
+        directionPointerCaret.setX(directionPointerCaret.x() - 2);
+
+    directionPointerCaret.setWidth(LayoutUnit(2));
+    directionPointerCaret.setHeight(LayoutUnit(1));
+
     Color caretColor = Color::black;
 
     Element* element;
@@ -254,6 +282,14 @@ void CaretBase::paintCaret(Node* node, GraphicsContext* context, const LayoutPoi
         caretColor = element->renderer()->resolveColor(CSSPropertyColor);
 
     context->fillRect(caret, caretColor);
+    context->fillRect(directionPointerCaret, caretColor);
+
+    // Update directionPointerCaret points and lets draw one more small rect to match IE.
+    directionPointerCaret.setY(caret.y() + LayoutUnit(1));
+    directionPointerCaret.setWidth(LayoutUnit(1));
+    if (containerDirection == RTL)
+        directionPointerCaret.setX(directionPointerCaret.x() + 1);
+    context->fillRect(directionPointerCaret, caretColor);
 }
 
 void DragCaretController::paintDragCaret(LocalFrame* frame, GraphicsContext* p, const LayoutPoint& paintOffset, const LayoutRect& clipRect) const