592093 - unexpected behavior when hovering a menu

Status: RESOLVED FIXED

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[Christophe Calvez]

User-Agent:       Mozilla/5.0 (Windows NT 5.1; rv:2.0b5pre) Gecko/20100830 Firefox/4.0b5pre
Build Identifier: Mozilla/5.0 (Windows NT 5.1; rv:2.0b5pre) Gecko/20100830 Firefox/4.0b5pre ID:20100830130834

Regression, linked to bugs 591657 and 587944
when hovering over a menu, like in the top blue bar on http://www.google.com/mobile/, the menu closes.

Reproducible: Always

Steps to Reproduce:
1. Go to http://www.google.com/mobile/
2. hover "Google for Your Phone"
3. hover down in the menu
Actual Results:  
The menu tends to close when the cursor gets over another item

Expected Results:  
the menu should stay open, and the new item should be highlighted.

similar behavior on http://www.youtube.com/movies/mystery_suspense, thanks to UI for comment 3 on bug 591657 :
> STR:
> 1. Visit: http://www.youtube.com/movies/mystery_suspense
> 2. Place your mouse pointer over any of the movie image tiles
> 3. Wait till the info pop-up appears then move your mouse off the pop-up
> 4. Crash.

Comment 1

[Timothy Nikkel (:tnikkel)]

The build you reported this bug with didn't have the fix for bug 591657. I could not reproduce the problem in a 2010-08-31 nightly (which has the fix for bug 591657). Christophe, could you try a new nightly and report back whether or not you can still see the problem?

Comment 2

[Christophe Calvez]

regarding the bug on google.com/mobile, reproduced in:
Mozilla/5.0 (Windows NT 5.1; rv:2.0b5pre) Gecko/20100830 Firefox/4.0b5pre ID:20100830130834 (tinderbox build)
Mozilla/5.0 (Windows NT 5.1; rv:2.0b5pre) Gecko/20100831 Firefox/4.0b5pre ID:20100831040721
Mozilla/5.0 (Windows NT 5.1; rv:2.0b5pre) Gecko/20100831 Firefox/4.0b5pre ID:20100831040721 Safe Mode
not reproduced in:
Mozilla/5.0 (Windows; U; Windows NT 5.1; fr; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8 ID:20100722155716

regarding youtube.com/movies/mystery_suspense, I think I was wrong, the behaviour is consistent over the different builds.

Tell me if you need more information.

Comment 3

[Timothy Nikkel (:tnikkel)]

I still can't reproduce on http://www.google.com/mobile/. I see the same behaviour on Firefox 3.6 as I do on the 2010-08-31 and 2010-09-01 nightlies. Can you give me any information I might need to reproduce?

Comment 4

[Christophe Calvez]

Attachment: video of the unwanted behavior, nightly 20100831040721

Just moving the cursor over the menu.

Comment 5

[Christophe Calvez]

reproduced in Mozilla/5.0 (Windows NT 5.1; rv:2.0b6pre) Gecko/20100901 Firefox/4.0b6pre ID:20100901041125

I'm trying to understand what happens with firebug, but I am far from an expert on javascript debugging. At the moment, I can only say it looks like it happens in google.com/mobile/js/mgc3-compiled.js :/

Comment 6

[Timothy Nikkel (:tnikkel)]

Ok, I think I can reproduce now. I guess I don't move my mouse cursor as fast as you. Quick movement seems to be the key for some reason.

Comment 7

[Christophe Calvez]

Could it be linked to the speed of the computer (polling speed) ? By setting a breakpoint on function "v" on line 70 of mgc3-compiled.js, I could see that when I hover from item to item, the menu is closed and opened. But it does the same on Fx 3.6.8. I could also note that with the breakpoint active, (and having to press F8 (continue) to continue the script execution), I couldn't reproduce the unwanted behavior.

I can't tell if the "unwanted" behavior is a real error. I can only tell that the script on this page with this version of Fx gives unwanted results.

Comment 8

[Timothy Nikkel (:tnikkel)]

Christophe, and I assume you don't see the problem in 2010-08-27 nightlies?

Comment 9

[Christophe Calvez]

Timothy, you're right, I should have checked this before.

menu stays open (wanted behavior):
Mozilla/5.0 (Windows NT 5.1; rv:2.0b5pre) Gecko/20100827 Minefield/4.0b5pre ID:20100827040251

crashes:
Mozilla/5.0 (Windows NT 5.1; rv:2.0b5pre) Gecko/20100828 Firefox/4.0b5pre ID:20100828040640
Mozilla/5.0 (Windows NT 5.1; rv:2.0b5pre) Gecko/20100829 Firefox/4.0b5pre ID:20100829040614

Comment 10

[Timothy Nikkel (:tnikkel)]

Could you try this try server build to see if the problem is fixed or not? Thanks.

http://ftp.mozilla.org/pub/mozilla.org/firefox/tryserver-builds/[e-mail]-bd035cc781da/

Comment 11

[Christophe Calvez]

Same behavior with this tryserver build, Mozilla/5.0 (Windows NT 5.1; rv:2.0b6pre) Gecko/20100904 Firefox/4.0b6pre ID:20100904154956

but I could notice that when I have other tabs open on some sites (maybe with JS ?), the unwanted behavior is harder to hit.
ie, with nightly "Mozilla/5.0 (Windows NT 5.1; rv:2.0b6pre) Gecko/20100904 Firefox/4.0b6pre ID:20100904041009", with gmail and google.com/mobile open, I have to move the cursor faster and a half dozen times to get the menu to close. Same with youtube. If I get this bugzilla page instead of gmail, I can hardly get the cursor on the first item of the menu.

Comment 12

[Timothy Nikkel (:tnikkel)]

Could you try these two try server builds? Thanks again.

http://ftp.mozilla.org/pub/mozilla.org/firefox/tryserver-builds/[e-mail]-953e476d3476/

http://ftp.mozilla.org/pub/mozilla.org/firefox/tryserver-builds/[e-mail]-1e73a253aaf9/

Comment 13

[Christophe Calvez]

It is reproducible in both of them. Again, if I have gmail open on another tab, I can't reproduce.

Is there a way I could give more interesting information on this ?

Comment 14

[Timothy Nikkel (:tnikkel)]

Can you try this try server build?
http://ftp.mozilla.org/pub/mozilla.org/firefox/tryserver-builds/[e-mail]-c5d26ab0ec67/

Comment 15

[Christophe Calvez]

Reproduced on:
Mozilla/5.0 (Windows NT 5.1; rv:2.0b6pre) Gecko/20100906 Firefox/4.0b6pre ID:20100906151630 (tryserver c5d26ab0ec67)
Mozilla/5.0 (Windows NT 5.1; rv:2.0b6pre) Gecko/20100906 Firefox/4.0b6pre ID:20100906041818 (nightly)

And I also re-checked nightly 20100722, google.com/mobile as only page open, not reproducible in 20100722.

Comment 16

[Timothy Nikkel (:tnikkel)]

Can you try a 2010-09-12 nightly or later and see if anything has changed here?

Comment 17

[Christophe Calvez]

no noticeable change in:
Mozilla/5.0 (Windows NT 5.1; rv:2.0b6pre) Gecko/20100912 Firefox/4.0b6pre ID:20100912041924

Comment 18

[Timothy Nikkel (:tnikkel)]

Should be fixed (on Windows) by bug 601547.

Comment 19

[Timothy Nikkel (:tnikkel)]

Had to back out bug 601547.

Comment 20

[Timothy Nikkel (:tnikkel)]

Landed bug 601547 again so this should be fixed (on Windows) by bug 601547 again.

Comment 21

[Christophe Calvez]

Thanks.
works fine in Mozilla/5.0 (Windows NT 5.1; rv:2.0b8pre) Gecko/20101010 Firefox/4.0b8pre ID:20101010041544
Shall I let the QA set the status to VERIFIED ?