147087 - DHTML menu javascript not working when mouse moves over overflow: auto; div underneath

Status: RESOLVED DUPLICATE of bug 125386

(Core :: Layout, defect, P4)

Description

[Joel Parker]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.0rc3)
Gecko/20020523
BuildID:    2002052306

When you move your mouse over the Games menu at the top of the page, a menu
drops down. When you move your mouse over the Software link, another menu pops
out. When you move your mouse over the first two links in that menu, everything
is fine. When you move your mouse below the second link, however, the menu
disappears. This is also the precise spot where the underlying div with
overflow: auto; begins.

Reproducible: Always
Steps to Reproduce:
1. Move mouse over Games menu
2. Move mouse over Software link
3. Move mouse over third link in popout box

Actual Results:  Menu disappears

Expected Results:  Menu should have stayed visible

Spot where mouse tracking fails is exact spot that underlying div with overflow:
auto; begins

Comment 1

[Boris Zbarsky [:bzbarsky]]

Chances are that script is reacting to all mouseout events without looking at 
their target....

Comment 2

[Laura Krietemeyer]

Changing QA Contact

Comment 3

[Amarendra Hanumanula]

Confirming the bug and setting the priority.

Comment 4

[Joel Parker]

Is there some kind of workaround for this? I'd like to keep the overflow: auto
div element, if possible, and still keep the DHTML menus. Are they mutually
exclusive at this point?

Comment 5

[Joel Parker]

Changed the URL field...

Comment 6

[Boris Zbarsky [:bzbarsky]]

Joel, could you possibly construct a smaller testcase?  (eg only one menu, no
other content, not nested menu)?

Either the mouseout event is being dispatched incorrectly or the code on the
page is treating it wrong, but there is so much going on that I can't usefully
tell which is the case...

Comment 7

[Joel Parker]

Attachment: testcase

Comment 8

[Boris Zbarsky [:bzbarsky]]

OK, I see that on Linux too... looks like moving over something with a view
causes a mouseout on the menu?

Comment 9

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

Known bug. I can't remember the number but it's a bug in the event state manager...

Comment 10

[gavin long]

Robert O'Callahan:

> I can't remember the number but it's a bug in the event 
> state manager...

bug 125386 ?

Comment 11

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

YEAH! That's it! thanks :-)

*** This bug has been marked as a duplicate of 125386 ***