[Bug 19763] [Custom]: Consider copying event listeners when upgrading elements

https://www.w3.org/Bugs/Public/show_bug.cgi?id=19763

Olli Pettay <bugs@pettay.fi> changed:

           What    |Removed                     |Added
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--- Comment #2 from Olli Pettay <bugs@pettay.fi> ---
I'm also against automatic copying.

onfoo="" handlers will be copied anyway, and
other listeners may easily keep the old element alive if not being
careful with js scopes etc.

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