Use correct offset when attribute auto is present

Source/core/dom/Position.cpp

Index: Source/core/dom/Position.cpp
diff --git a/Source/core/dom/Position.cpp b/Source/core/dom/Position.cpp
index 64f8730cc6f540937921deecae0cba42dc7c9d30..76324f6f02c07cedb10e9c51750b0b272049b719 100644
--- a/Source/core/dom/Position.cpp
+++ b/Source/core/dom/Position.cpp
@@ -79,6 +79,14 @@ static Node* previousRenderedEditable(Node* node)
     return 0;
 }
 
+static bool isTextDirectionAuto(Node *node)

[leviw_travelin_and_unemployed, 2014/05/29 16:32:18]

This is asking to be misused. This function doesn't answer the question of
whether or not the node you pass in is dirAuto... It's answering whether or not
the focused element is.

+{
+    bool isAuto = false;
+    if (node->document().focusedElement())

[leviw_travelin_and_unemployed, 2014/05/29 16:32:18]

This just isn't right. getInlineBoxAndOffset shouldn't give different answers
depending on the focused node. I'm fine with you crawling up the ancestor chain
for node, which in your test should yield you the node you're using here, right?

[Habib Virji, 2014/05/30 16:05:10]

On 2014/05/29 16:32:18, leviw wrote:
@leviw: An update, still struggling:

The text area typically renders into:
RenderTextControl {TEXTAREA}, 
 RenderBlock {DIV} 
  RenderText {#text}

So when i traverse upward from anchorNode in getInlineBoxAnfOffset, i end up in
Div and not in TextArea. (I am looking for if node is isBlock or isElement
node.). Attribute dir does not seem to be set for div. 

Regarding selfOrAncestorHasDirAutoAttribute, which gets set from HtmlElement
does not return for the focus node instead when the element is not in focus it
returns correct result. I am debugging further to understand this behavior.

+        toHTMLElement(node->document().focusedElement())->directionalityIfhasDirAutoAttribute(isAuto);
+    return isAuto;
+}
+
 Position::Position(PassRefPtr<Node> anchorNode, LegacyEditingOffset offset)
     : m_anchorNode(anchorNode)
     , m_offset(offset.value())
@@ -1260,7 +1268,10 @@ void Position::getInlineBoxAndOffset(EAffinity affinity, TextDirection primaryDi
                     break;
                 inlineBox = prevBox;
             }
-            caretOffset = inlineBox->caretLeftmostOffset();
+            if (isTextDirectionAuto(m_anchorNode.get()))
+                caretOffset = (inlineBox->bidiLevel() < level) ? inlineBox->caretLeftmostOffset() : inlineBox->caretRightmostOffset();
+            else
+                caretOffset = inlineBox->caretLeftmostOffset();
         } else if (nextBox->bidiLevel() > level) {
             // Left edge of a "tertiary" run. Set to the right edge of that run.
             while (InlineBox* tertiaryBox = inlineBox->nextLeafChildIgnoringLineBreak()) {