230086 - Destructor of XBL element isn't called when I remove this element from DOM

Status: RESOLVED WONTFIX

(Core :: XBL, defect)

Description

[alexander :surkov (:asurkov)]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.5) Gecko/20031007
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.5) Gecko/20031007

When I remove XBL element from DOM by removeChild() method than XBL destructor
isn't called. I think desctructor should be called.

Reproducible: Always

Steps to Reproduce:

Comment 1

[Benjamin Smedberg]

testcase, please

Comment 2

[alexander :surkov (:asurkov)]

Attachment: This is test xbl

Comment 3

[alexander :surkov (:asurkov)]

Attachment: Run me

Comment 4

[Gervase Markham [:gerv] (not reading bugmail)]

This is an automated message, with ID "auto-resolve01".

This bug has had no comments for a long time. Statistically, we have found that
bug reports that have not been confirmed by a second user after three months are
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Comment 5

[Boris Zbarsky [:bzbarsky]]

Unfortunately, detaching bindings when removing from a document would actually
break a good deal of our content.  We need to come up with a sane XBL attachment
story...

Comment 6

[alexander :surkov (:asurkov)]

Should be desctuctor called? Note a bug 265086.

Comment 7

[Mike Schroepfer]

Jonas is this something we want to get fixed?

Comment 8

[Jonas Sicking (:sicking) No longer reading bugmail consistently]

Not for firefox 3 unless this is holding back extension developers a lot?

The leak in bug 296474 should be fixable through other means.

Comment 9

[Mike Schroepfer]

(In reply to comment #8)
> Not for firefox 3 unless this is holding back extension developers a lot?
> 
> The leak in bug 296474 should be fixable through other means.
> 

Will the leak in 296474 show up for others - e.g. is this a place to fix the issue for everyone...

Comment 10

[Jonas Sicking (:sicking) No longer reading bugmail consistently]

Yeah, most likely.

Comment 11

[Boris Zbarsky [:bzbarsky]]

Note that we could just have a pending destructor queue (like pending ctors), add bindings to it where we currently tear down the binding implementation, and do all that, plus firing destructor, in either EndUpdate or off an event (like we do constructors).

It's a scary change, though.  Really scary.  Likely to break some chrome, I bet (due to chrome working around this bug, at least in part).

Comment 12

[Jonas Sicking (:sicking) No longer reading bugmail consistently]

Yeah, i'm more worried about chrome depending on things working as they currently are, than not being able to implement this "safely".

Comment 13

[Dão Gottwald [::dao]]

Are there some concrete examples for how a chrome dependency on this might look like? I'm not sure the dependency actually exists. But if it does, I guess it would be trivial to fix.

Comment 14

[Boris Zbarsky [:bzbarsky]]

XBL is now disabled in Firefox (Bug 1583314) and is in the process of being removed from Gecko (Bug 1566221), so closing bugs requesting changes to its implementation as wontfix.