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<Krenair> Krinkle, http://imgur.com/a39IuMk - that's handlers, handlers.length, handleObj
<Krenair> Immediately after handlers.push( handleObj ); in jquery.event.add

handlers.push( handleObj );
if ( types.indexOf( 'keydown' ) !== -1 ) {
	console.log( handlers );
	console.log( handlers.length );
	console.log( handleObj );
}

Created attachment 16743 [details]
Screenshot of bug not happening.

I can't reproduce this. When typing in the input, I see all keydowns happening as they should. From the key codes in the screenshot:
* [shift]
* E
* x
* a
* m
* p
* l
* e
* [enter]

The handler from MWCategoryWidget is working fine. However, here is the code I used for comment #2

In ve/ui/MWCategoryWidget.js:

	this.input.$input.on( 'keypress', function () {
		console.log( ['MWCategoryWidget', 'MWCategoryInputWidget', '$input', 'keypress'] );
	} );
	this.input.on( 'enter', function () {
		console.log( ['MWCategoryWidget', 'MWCategoryInputWidget', 'enter'] );
	} );

And the 'enter' event never fired. Because there is still a mystery here. The event bound by OO.ui.TextInputWidget on $input for 'keypress' (which fires 'enter') disappears somehow.

Putting the same logger in there makes it never fire.

Nevermind. They all work fine now. There is still a tech debt here though, we should use OOjs UI's "enter" event (instead of manually binding keypress and looking for keyCode=13), but it works fine.

(In reply to Krinkle from comment #4)
> There is still a tech debt here though, we should use OOjs UI's "enter" event 
> (instead of manually binding keypress

Done in Ia47bc8976f22dfe7e3a6fb6068dc4b6e03a3357b.