onchange function might be executed twice in IE8

[mlangc]

Registering two change event handlers on the same element, one with jQuery.change() and another with element.onchange leads to the event handler that has been assigned to onchange to be executed twice. A simple example that illustrates this is attached.

[mlangc]

Simple testcase

[brightertools]

I get a similar problem when hard-wiring an onchange event on a select list and binding a 'change' event. the hard-wired event gets called twice in IE.

more info here:  http://stackoverflow.com/questions/2888800/html-select-list-why-would-onchange-be-called-twice

[snover]

Duplicate of #6593.