INPUT/TEXTAREA elements: Dispatch 'select' event only if text selection is changed.

third_party/WebKit/Source/core/html/HTMLTextAreaElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights
  * reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 359 matching lines @@
   m_isDirty = true;
   const_cast<HTMLTextAreaElement*>(this)->updatePlaceholderVisibility();
 }
 
 String HTMLTextAreaElement::value() const {
   updateValue();
   return m_value;
 }
 
 void HTMLTextAreaElement::setValue(const String& value,
-                                   TextFieldEventBehavior eventBehavior) {
-  setValueCommon(value, eventBehavior);
+                                   TextFieldEventBehavior eventBehavior,
+                                   TextControlSetValueSelection selection) {
+  setValueCommon(value, eventBehavior, selection);
   m_isDirty = true;
 }
 
 void HTMLTextAreaElement::setNonDirtyValue(const String& value) {
-  setValueCommon(value, DispatchNoEvent);
+  setValueCommon(value, DispatchNoEvent,
+                 TextControlSetValueSelection::kSetSelectionToEnd);
   m_isDirty = false;
 }
 
-void HTMLTextAreaElement::setValueCommon(const String& newValue,
-                                         TextFieldEventBehavior eventBehavior) {
+void HTMLTextAreaElement::setValueCommon(
+    const String& newValue,
+    TextFieldEventBehavior eventBehavior,
+    TextControlSetValueSelection selection) {
   // Code elsewhere normalizes line endings added by the user via the keyboard
   // or pasting.  We normalize line endings coming from JavaScript here.
   String normalizedValue = newValue.isNull() ? "" : newValue;
   normalizedValue.replace("\r\n", "\n");
   normalizedValue.replace('\r', '\n');
 
   // Return early because we don't want to trigger other side effects when the
   // value isn't changing. This is interoperable though the specification
   // doesn't define so.
   // https://github.com/whatwg/html/issues/2412
   if (normalizedValue == value())
     return;
 
   m_value = normalizedValue;
   setInnerEditorValue(m_value);
   if (eventBehavior == DispatchNoEvent)
     setLastChangeWasNotUserEdit();
   updatePlaceholderVisibility();
   setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(
                                               StyleChangeReason::ControlValue));
   m_suggestedValue = String();
   setNeedsValidityCheck();
-  if (isFinishedParsingChildren()) {
+  if (isFinishedParsingChildren() &&
+      selection == TextControlSetValueSelection::kSetSelectionToEnd) {
     // Set the caret to the end of the text value except for initialize.
     unsigned endOfString = m_value.length();
     setSelectionRange(endOfString, endOfString);
   }
 
   notifyFormStateChanged();
   switch (eventBehavior) {
     case DispatchChangeEvent:
       dispatchFormControlChangeEvent();
       break;
@@ skipping 200 matching lines @@
 
 const AtomicString& HTMLTextAreaElement::defaultAutocapitalize() const {
   DEFINE_STATIC_LOCAL(const AtomicString, sentences, ("sentences"));
   return sentences;
 }
 
 void HTMLTextAreaElement::copyNonAttributePropertiesFromElement(
     const Element& source) {
   const HTMLTextAreaElement& sourceElement =
       static_cast<const HTMLTextAreaElement&>(source);
-  setValueCommon(sourceElement.value(), DispatchNoEvent);
+  setValueCommon(sourceElement.value(), DispatchNoEvent,
+                 TextControlSetValueSelection::kSetSelectionToEnd);
   m_isDirty = sourceElement.m_isDirty;
   TextControlElement::copyNonAttributePropertiesFromElement(source);
 }
 
 }  // namespace blink