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 dacff4069ead02e8d5f39e0d2d15bf0d9294ea25..288e66d133a4d2b57b60d5d569dd312a479e7a80 100644
--- a/Source/core/dom/Position.cpp
+++ b/Source/core/dom/Position.cpp
@@ -79,6 +79,20 @@ static Node* previousRenderedEditable(Node* node)
     return 0;
 }
 
+static bool hasDirectionAutoAttribute(Node* node)
+{
+    if (node->selfOrAncestorHasDirAutoAttribute())
+        return true;
+    if (node->isInShadowTree()) {
+        while (node) {
+            if (node->isShadowRoot())

[esprehn, 2014/06/11 00:58:01]

This can just be node->containingShadowRoot() which is constant time and has no
tree walk.

[Habib Virji, 2014/06/11 08:56:01]

Done.

+                return node->shadowHost()->selfOrAncestorHasDirAutoAttribute();
+            node = node->parentNode();
+        }
+    }
+    return false;
+}
+
 Position::Position(PassRefPtrWillBeRawPtr<Node> anchorNode, LegacyEditingOffset offset)
     : m_anchorNode(anchorNode)
     , m_offset(offset.value())
@@ -1260,7 +1274,10 @@ void Position::getInlineBoxAndOffset(EAffinity affinity, TextDirection primaryDi
                     break;
                 inlineBox = prevBox;
             }
-            caretOffset = inlineBox->caretLeftmostOffset();
+            if (hasDirectionAutoAttribute(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()) {