645529 - DOMMouseScroll event stops firing after child modal window was closed before onload fired

Status: NEW

(Firefox :: General, defect)

Description

[V@no]

User-Agent:       Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0
Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0

If a modal window closes window BEFORE onload event was fired, the opener window stops receiving DOMMouseScroll events.

Reproducible: Always

Steps to Reproduce:
1. install attached example extension
2. open a webpage that needs to scroll and make sure mouse wheel scrolls the page
3. press ALT+1 and try scroll with mouse wheel
Actual Results:  
mouse wheel doesn't scroll page anymore

Expected Results:  
mouse wheel should scroll page normally

The only way to restore mouse wheel scroll is either switch tabs or focus on different window.



The attached extension has several controls that you can test it with:
ALT+1 executes alert()
ALT+2 executes open()
ALT+3 executes openDialog()
ALT+4 switching mode between "don't close", "close before onload" and "close after unload"
ALT+5 toggles modal

This bug affects only one combination:
modal = true
mode = "close before onload"

This seems to affect only Firefox v4, while v3.x is not affected.

Comment 1

[V@no]

Attachment: Example of an extension that opens modal window

The extension has

Comment 2

[V@no]

Just noticed if execute
window.focus();

just before
window.close();

the scroll will continue work just fine.

Comment 3

[Alex Lakatos[:AlexLakatos]]

Confirmed on Build identifier: Mozilla/5.0 (Windows NT 5.1; rv:2.0) Gecko/20100101 Firefox/4.0