Reland: Made content editables report the caret and text selection by treating them as text controls

Source/modules/accessibility/AXLayoutObject.cpp

 /*
 * Copyright (C) 2008 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 1627 matching lines @@
 {
     if (!isAttachment())
         return 0;
     return toLayoutPart(m_layoutObject)->widget();
 }
 
 //
 // Selected text.
 //
 
 AXObject::PlainTextRange AXLayoutObject::selectedTextRange() const

[dmazzoni, 2015/04/02 06:54:55]

I believe this function needs to be updated to handle contentEditable. There may
be some code there, maybe under ariaSelectedTextRange, but I don't think it's
complete and correct.

 {
     if (!isTextControl())
         return PlainTextRange();
 
     AccessibilityRole ariaRole = ariaRoleAttribute();
     if (isNativeTextControl() && ariaRole == UnknownRole && m_layoutObject->isTextControl()) {
         HTMLTextFormControlElement* textControl = toLayoutTextControl(m_layoutObject)->textFormControlElement();
         return PlainTextRange(textControl->selectionStart(), textControl->selectionEnd() - textControl->selectionStart());
     }
 
@@ skipping 182 matching lines @@
     }
 
     if (!isTextControl())
         return 0;
 
     Node* node = m_layoutObject->node();
     if (!node)
         return 0;
 
     Position indexPosition = pos.deepEquivalent();
-    if (indexPosition.isNull() || highestEditableRoot(indexPosition, HasEditableAXRole) != node)
+    if (indexPosition.isNull()
+        || highestEditableRoot(indexPosition) != node
+        && highestEditableRoot(indexPosition, HasEditableAXRole) != node)
         return 0;
 
     RefPtrWillBeRawPtr<Range> range = Range::create(m_layoutObject->document());
     range->setStart(node, 0, IGNORE_EXCEPTION);
     range->setEnd(indexPosition, IGNORE_EXCEPTION);
 
     return TextIterator::rangeLength(range->startPosition(), range->endPosition());
 }
 
 void AXLayoutObject::addInlineTextBoxChildren(bool force)
@@ skipping 505 matching lines @@
         if (label && label->layoutObject()) {
             LayoutRect labelRect = axObjectCache()->getOrCreate(label)->elementRect();
             result.unite(labelRect);
         }
     }
 
     return result;
 }
 
 } // namespace blink