Dispatch change event for input type=checkbox when checked but value is null

Source/core/html/HTMLTextFormControlElement.cpp

Index: Source/core/html/HTMLTextFormControlElement.cpp
diff --git a/Source/core/html/HTMLTextFormControlElement.cpp b/Source/core/html/HTMLTextFormControlElement.cpp
index c3f751a63f54d4eb643bdb97275b0ecbe1ae555c..179bf18f5dd386c5ea89f83d2bdb5f7bb175d53d 100644
--- a/Source/core/html/HTMLTextFormControlElement.cpp
+++ b/Source/core/html/HTMLTextFormControlElement.cpp
@@ -184,7 +184,7 @@ void HTMLTextFormControlElement::select()
 
 void HTMLTextFormControlElement::dispatchFormControlChangeEvent()
 {
-    if (!equalIgnoringNullity(m_textAsOfLastFormControlChangeEvent, value())) {
+    if (!equalIgnoringNullity(m_textAsOfLastFormControlChangeEvent, value()) || (type() == "checkbox" && m_textAsOfLastFormControlChangeEvent != value())) {

[tkent, 2014/04/29 23:43:41]

Please do not add input-type checking to HTMLTextFormControlElement.
We should have new virtual function for this line, or CheckboxInputType should
not use HTMLTextFormControlElement::dispatchFormControlChangeEvent.

         dispatchChangeEvent();
         setTextAsOfLastFormControlChangeEvent(value());
     }