739437 - Dev Derby: Wrong thumbnail when hovering

Status: VERIFIED FIXED

(developer.mozilla.org Graveyard :: Wiki pages, defect)

Description

[John Karahalis [:openjck]]

Attachment: Wrong thumbnail

When hovering over a submission, the "hover box" occasionally shows the wrong thumbnail. I have had a hard time reproducing this, but it happens at least a couple of times per week. Attached is a thumbnail of what it basically looks like.

Annoying, but not critical. Definitely a post-Kuma bug.

Comment 1

[John Karahalis [:openjck]]

Some additional details:

* When this happens, the thumbnail is correct before and after I hover (but again, not while I hover).
* When this happens, the page sometimes cycles through several incorrect thumbnails before it lands on one (still incorrect) thumbnail.
* This may affect the Demo Studio as well. I don't remember if I've ever seen that.

Comment 2

[John Karahalis [:openjck]]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:12.0) Gecko/20100101 Firefox/12.0

Comment 3

[John Karahalis [:openjck]]

Attachment: Hover issue in action (not a simulation this time)

Attaching a screenshot of the real problem, in action. It's still very hard to reproduce, through. Just keep hovering on things until it happens. Shouldn't take more than a couple of minutes.

Chat with craigcook copied below:

18:34 <craigcook> openjck: is it just the thumbnail image, or the entire box? title, author etc?
18:35 <openjck> Hm. Good question. It's hard to replicate the issue, but the latter does sound about right.
18:35 <openjck> Very hard to remember.
18:35 <openjck> craigcook: ^
18:36 <openjck> I'll keep an eye on that when it happens again.
18:36 <craigcook> the hover box is actually a clone of the box over which you're hovering, created and destroyed on the fly? but there could be a glitch where the box doesn't get destroyed when it fades out, and so you might see the previous box next time you hover another demo
18:37 <openjck> Ah!
18:37 <openjck> Yeah, that sounds about right.
18:37 <openjck> I think I remember seeing the thumbnail of the last box I hovered over.
18:38 <craigcook> if we can consistently reproduce it we should be able to fix it? could just add another check that forcibly destroys an existing clones before creating a new one. Or something like that.
18:39 <openjck> craigcook: You're right. That's it. I was able to reproduce it, too.
18:39 <openjck> It's the thumnail, title, etc. of the one I last clicked on.
18:39 <craigcook> ok
18:40 <openjck> And it seems to happen when I move from one to the other quickly.
18:40 <craigcook> so yeah, I bet when you click it doesn't get properly destroyed, so when you hover over another one it's still showing the old clone? should be fixable

Comment 4

[John Karahalis [:openjck]]

I've found a pretty easy way to reproduce this:

1. Hover over a demo thumbnail.
2. Without moving the mouse, scroll up or down the page until you end up hovering over some other demo.
3. Keep repeating step #2 until you see the issue. It might take a few trials, but after that it should happen every single time.

Comment 5

[David Walsh :davidwalsh]

Is this still relevant?  How do I get to this page?

Comment 6

[John Karahalis [:openjck]]

Yep. I still see this from time to time. You can reproduce it on either of the following pages, and others:

https://developer.mozilla.org/en-US/demos/devderby/2012/july
https://developer.mozilla.org/en-US/demos/

Comment 7

[[github robot]]

Commits pushed to master at https://github.com/mozilla/kuma

https://github.com/mozilla/kuma/commit/5f3b948f4fc8f1b5dbbd3635c1b67602a97f8806
fix bug 739437 - Prevent duplicate thumbnail hover

https://github.com/mozilla/kuma/commit/97f51cf322c537efb5c68815651a7dc53dda6e20
Merge pull request #810 from darkwing/tooltip-739437

fix bug 739437 - Prevent duplicate thumbnail hover

Comment 8

[raymond [:retornam] (inactive)]

verified fixed https://developer.allizom.org/en-US/demos/