My take: Avoid modifying (hyjacking) core code. Instead write a new class 
that extends the one you wanted to modify and use that. If you are 
attempting to change the core functionality I would recommend cloning the 
repo and make the change in the core code on you own branch. If it is 
something worth while it could be submitted as pull request maybe behind a 
config option.

On Monday, December 28, 2015 at 3:09:06 PM UTC-5, Tobias Beer wrote:
>
> Hi Jeremy,
>  
>
>> Obviously, this is a technique of last resort…
>>
>
> I agree and I would not ask for how to do it would I see another way.
>
> For the appear widget (demo) <http://appear-demo.tiddlyspot.com> I have now 
> "properly" hijacked 
> <https://github.com/tobibeer/tw5-appear/blob/master/src/appear.js#L379-L425>
> ...
>
> Popup.prototype.show = function(options) {...}
>
> ...so as to allow absolutely positioned popups 
> <https://github.com/Jermolene/TiddlyWiki5/pull/2128>.
>
> Best wishes,
>
> Tobias. 
>

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