Do not dispatch 'change' events during pressing spin buttons for input[type=number].

Source/core/html/forms/TextFieldInputType.cpp

Index: Source/core/html/forms/TextFieldInputType.cpp
diff --git a/Source/core/html/forms/TextFieldInputType.cpp b/Source/core/html/forms/TextFieldInputType.cpp
index 041d0307d823880aa98a8326103e359f9742e37a..6df7ed5462bbd1e17ce3caf529be6401946ebf15 100644
--- a/Source/core/html/forms/TextFieldInputType.cpp
+++ b/Source/core/html/forms/TextFieldInputType.cpp
@@ -212,6 +212,8 @@ void TextFieldInputType::handleKeydownEventForSpinButton(KeyboardEvent* event)
         spinButtonStepDown();
     else
         return;
+    if (element().focused())

[tkent, 2014/03/18 08:26:20]

Why is the focus check needed? It looks unnecessary.

+        element().dispatchFormControlChangeEvent();
     event->setDefaultHandled();
 }
 
@@ -558,4 +560,12 @@ bool TextFieldInputType::shouldSpinButtonRespondToWheelEvents()
     return shouldSpinButtonRespondToMouseEvents() && element().focused();
 }
 
+void TextFieldInputType::spinButtonDidReleaseMouseCapture()
+{
+    // Sending dispatch change event only when in focus,
+    // as when out of focus change event is triggered from setValue::DispatchChangeEvent.
+    if (element().focused())

[tkent, 2014/03/18 08:26:20]

Ditto.

+        element().dispatchFormControlChangeEvent();
+}
+
 } // namespace WebCore