454583 - Mousemove events can fire during synchronous XMLHttpRequest, violating run-to-completion model

Status: RESOLVED DUPLICATE of bug 333198

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

Description

[Sjoerd Mulder]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.1) Gecko/2008070208 Firefox/3.0.1
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.1) Gecko/2008070208 Firefox/3.0.1

When listening to the mousemove event, normally every event fired will only fire when the previous event is finished even when having synchronous XMLHttpRequest. But in Fx 3.0.1 this is not the case anymore when an XMLHttpRequest is inside the execution

Reproducible: Always

Steps to Reproduce:
1. Open attached file
2. Jank your mouse, the mousemove coordinates should appear
3. The message "This should not be possible" appears one or multiple times
Actual Results:  
In all browser except Fx 3 the message "This should not be possible" does not appear (as it should be). This should be the result


This is very annoying for AJAX toolkits, which use JIT mechanisms to dynamically load extra javascript.

Comment 1

[Sjoerd Mulder]

Attachment: Testcase reproducing the problem

Comment 2

[Jesse Ruderman]

Dup of bug 340345?