101698 - [DHTML] Flickering dynamic menu

Status: RESOLVED FIXED

(Core :: Layout, defect, P2)

Description

[Markus Hübner]

For example move over "Solutions" then the menu-items will appear.
If you move down the whole list flickers.

This works fine in Opera, MSIE and also in Netscape 6.1 - so must be somehow 
regressed since then.

Using build 2001092503

Comment 1

[Jerome Lacoste]

same for me on W2k 0.9.4+ (2001092308)
May have appeared before.

Comment 2

[Marc Attinasi]

Appears to have regressed some time between 07-25 and 09-17 - needs more
narrowing, obviously.

Comment 3

[Markus Hübner]

another terrible looking example is
http://www.gebr-weiss.com/
try for example "produkte" it's flickering heavily.

Comment 4

[basic]

http://www.nextra.com seems to only flicker when I move the mouse cursor as fast
as I can (without leaving the menu).

http://www.gebr-weiss.com/ on the other hand is causing flicker on each link on
the menu.

build 2001102903 win32

I think this is caused by the way mozilla reflows.

Markus: think you could create a very simple testcase?

Comment 5

[Markus Hübner]

http://www.factiva.com/
[just move over "products", ....]
would be another example.

Comment 6

[basic]

build 2001120603 win32

oddly I don't see any flickering in this build with the 3 URLs

Comment 7

[basic]

maybe I was testing it wrong.....

I don't see this problem all the time, just sometimes when I hover on the menus
real fast, and even then I'm not sure if I've left the menu and come back. It
might help to know when a onmouseover onmouseout event happens...

Comment 8

[basic]

matic: could you create a really big menu for testing :-) ?

Comment 9

[Markus Hübner]

Created a (big quite big) testcase :-) at
http://www.world-direct.com/mozilla-testcases/101698/nextra.htm

Comment 10

[basic]

ok this is not a mozilla bug but a mozilla feature. The flickering occurs
because a mouseout on the DIV is being caused by mouseout events bubbling from
the elements in the DIV. I'll attach a testcase

Comment 11

[basic]

Attachment: testcase with enable/disable bubbling

Comment 12

[basic]

the testcase is a "menu" of sorts. when you select disable bubbling the table in
the DIV captures all mouseout events and stops it from propagating to the DIV.

note that further optimisation can be done for onmouseover

now the curious thing is that it is not seen in NS6.1
matic: could you try my testcase in NS6.1?

Comment 13

[basic]

Attachment: better testcase with enable/disable bubbling

Comment 14

[Gilles Durys]

Here are the results on my P2-350,  win98
- with bubbling enabled:
flickering with 2001120703, ns 6.2.1
no flickering with k-meleon 0.6

- with bubbling disabled:
no flickering on 2001120703, ns 6.2.1, k-meleon 0.6

Comment 15

[Alfonso Martinez]

The last testcase flickers a lot for me with w98 P2 at 350 MHz, Mozilla build
2001120603, and  0.9.6 IF bubbling is enabled. If I select to disable it then no
flicker happens.

Testing with K-meleon 0.6 then no flicker happens no matter if bubbling is
enabled or not.

Comment 16

[Alvaro Munoz-Aycuens]

WFM on Linux build id 2001120708 Athlon 1333 and Linux build id 2001120703 Duron
700, but i confirm on Win98 build id 2001120703 on the duron, latest Basic
testcase with bubble enabled, makes moz to flicker like mad on windows.

Comment 17

[Alvaro Munoz-Aycuens]

WFM on Mac OS 9 build id: 2001120604 PowerPC 233
No flicker produced with either bubbling enabled or disabled, moving the mouse
really fast :), produces the same effect.

Comment 18

[rubydoo123]

In the testcase from:
------- Additional Comment #13 From [e-mail] 2001-12-08 10:54 -------

Created an attachment (id=60943)
better testcase with enable/disable bubbling

I can easily reproduce the flickering using the build from 2001121003 on win98, 
with bubbling enabled. When I ran the mouse over the links the flickering was 
quite apparent, running the mouse along the side border did not cause the 
flicker. Turning the disabling the bubbling caused the flickering to stop.

Comment 19

[Markus Hübner]

Any news on this one?

Comment 20

[Kevin McCluskey (gone)]

Moving to Moz1.1. nsbeta1-. Engineers are overloaded with higher priority bugs.

Comment 21

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

It sounds like this bug is really "onmouseout events bubble when they probably
shouldn't", which would be a DOM issue ... Fabian, care to comment?

Comment 22

[Fabian Guisset]

http://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113/events.html#Events-MouseEvent
mouseout
    The mouseout event occurs when the pointing device is moved away from an
element. This event is valid for most elements..
        * Bubbles: Yes
        * Cancelable: Yes

that's all I can say... If the bubbling is the _only_ cause of the flickering,
then this bug is probably invalid... The fact that it is a regression makes it
sound like there is another cause to this bug than the bubbling, though. Or
perhaps bubbling has been fixed since 6.1 (in which case it's an evangelism
bug). If someone could send a mail to joki about this, it would probably help.

Comment 23

[Markus Hübner]

joki: what's your view on that?

Comment 24

[Markus Hübner]

The flickering is causing a very visible annoyance.
If a fix isn't to difficult than this would be highly appreciated.

Comment 25

[Kevin McCluskey (gone)]

the flicker on http://www.factiva.com/ is fixed by the patch in bug 163528

Comment 26

[Kevin McCluskey (gone)]

I can not reproduce the flicker on http://www.gebr-weiss.com/ using a cvs trunk
build from this morning on WINXP

Comment 27

[Kevin McCluskey (gone)]

Taking.

Comment 28

[Kevin McCluskey (gone)]

Resolving as fixed since I do not see the flicker on http://www.factiva.com/ now
that my patch for bug 163528 has been checked in. I could not reproduce the
flicker on the other URL's listed in this bug.