640415 - assignment to history.pushState is reverted at a strange time

Status: RESOLVED DUPLICATE of bug 593910

(Core :: DOM: Core & HTML, defect)

Description

[Glenn Maynard]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows NT 5.2; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0

Assigning window.history.pushState = null is allowed, but reverts to the original method later, with no obvious trigger.

At http://zewt.org/~glenn/test-ff4rc1-pushState-assignment.html, "null" is logged immediately, after onload and after one second, but after five seconds the original method is back.

[20:01:36.137] 1 null
[20:01:36.147] 2 null
[20:01:37.138] 3 null
[20:01:41.138] 4 function pushState() {[native code]}

(Encountered while working around #640387.)


Reproducible: Always

Comment 1

[Boris Zbarsky [:bzbarsky]]

We don't preserve history objects with expandos on them, so I would expect that it gets GCed and you get a new history object....

Comment 2

[Justin Lebar (not reading bugmail)]

Is this a dupe of bug 593910?

Comment 3

[Boris Zbarsky [:bzbarsky]]

Yes.