373518 - event.relatedTarget is never set when leaving popup

Status: RESOLVED INVALID

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

Description

[Gomita]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; ja-JP; rv:1.8.1.2) Gecko/20070219 Firefox/2.0.0.2 webaroo/1.2
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a3pre) Gecko/20070308 Minefield/3.0a3pre

When I leave popup, mouseout event is fired but never have the relatedTarget on Trunk builds.
This makes impossible to figure out where I am after leaving popup.

Reproducible: Always

Steps to Reproduce:
1. Open the upcoming testcase.
2. Right-click to show popup.
3. Hover on popup.
4. Leave popup.
Actual Results:  
The textbox showing the relatedTarget for mouseout events are:
menuitem > popup > null

I get this result on Firefox 3.0a3pre.

Expected Results:  
The textbox showing the relatedTarget for mouseout events are:
null > menuitem > popup > page

I get this result on Firefox 2.0.0.2.

I don't know this bug is a regression on trunk build or not.

Comment 1

[Gomita]

Attachment: Testcase

Comment 2

[Ria Klaassen (not reading all bugmail)]

Regression range for this is 2006-01-09 05 - 2006-01-09 12.
Checkins: http://bonsai.mozilla.org/cvsquery.cgi?module=PhoenixTinderbox&date=explicit&mindate=2006-01-09+04%3A00&maxdate=2006-01-09+13%3A00
I think this must be Bug 321098. 

Comment 3

[Ere Maijala (slow)]

The fix for bug 321098 made the Windows widget layer behavior consistent with Linux, and indeed this problem is also seen in gtk builds. I'd say this is a problem of event state manager. I'll try to see if I can find a way to fix it.

Comment 4

[Ere Maijala (slow)]

Attachment: Possible patch

Roc, do you think we could do something like this? It fixes this problem and doesn't regress bug 321098, but would it cause something else to break?

Comment 5

[Robert O'Callahan (:roc) (email my personal email if necessary)]

If there's a menu showing, and the mouse is over a content document, and you move it into the menu, does the content document get a mouseout event with the menu content as the relatedTarget? I'm afraid it might. That would be very bad.

Comment 6

[Ere Maijala (slow)]

No, in that case relatedTarget is null. I tested by adding 

onmouseout="handleMouseOut(event);"

to page in the test case.

Comment 7

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Why is it null?

Comment 8

[Ere Maijala (slow)]

Apparently because the notification is done at <http://mxr.mozilla.org/seamonkey/source/content/events/src/nsEventStateManager.cpp#2700> and the target is never relayed there.