A11y: Don't accounce password keystrokes twice

third_party/WebKit/Source/core/layout/LayoutText.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 1765 matching lines @@
                   String(&revealed_text, 1));
     // m_text may be updated later before timer fires. We invalidate the
     // lastTypedCharacterOffset to avoid inconsistency.
     secure_text_timer->Invalidate();
   }
 }
 
 void LayoutText::SetText(PassRefPtr<StringImpl> text, bool force) {
   DCHECK(text);
 
-  if (!force && Equal(text_.Impl(), text.Get()))
+  bool equal = Equal(text_.Impl(), text.Get());
+  if (equal && !force)
     return;
 
   SetTextInternal(std::move(text));
   // If preferredLogicalWidthsDirty() of an orphan child is true,
   // LayoutObjectChildList::insertChildNode() fails to set true to owner.
   // To avoid that, we call setNeedsLayoutAndPrefWidthsRecalc() only if this
   // LayoutText has parent.
   if (Parent())
     SetNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation(
         LayoutInvalidationReason::kTextChanged);
   known_to_have_no_overflow_and_no_fallback_fonts_ = false;
 
-  if (AXObjectCache* cache = GetDocument().ExistingAXObjectCache())
-    cache->TextChanged(this);
+  // Don't bother updating the AX tree if there's no change. Otherwise, when
+  // typing in password fields, we would announce each "dot" twice: once when a
+  // character is typed, and second when that character is hidden.
+  if (!equal) {
+    AXObjectCache* cache = GetDocument().ExistingAXObjectCache();
+    if (cache)
+      cache->TextChanged(this);
+  }
 
   TextAutosizer* text_autosizer = GetDocument().GetTextAutosizer();
   if (text_autosizer)
     text_autosizer->Record(this);
 }
 
 void LayoutText::DirtyOrDeleteLineBoxesIfNeeded(bool full_layout) {
   if (full_layout)
     DeleteTextBoxes();
   else if (!lines_dirty_)
@@ skipping 319 matching lines @@
   LayoutRect rect = LayoutRect(
       IntRect(FirstRunX(), FirstRunY(), lines_box.Width(), lines_box.Height()));
   LayoutBlock* block = ContainingBlock();
   if (block && HasTextBoxes())
     block->AdjustChildDebugRect(rect);
 
   return rect;
 }
 
 }  // namespace blink