18497 - When switching between images on the fly using JavaScript mouse over events, sometimes images smear or distort

Status: VERIFIED FIXED

(Core :: Graphics: ImageLib, defect, P3)

Description

[Brian Coverstone]

When switching between images on the fly for JavaScript mouse over events,
sometimes the images will distort.  To see exactly what I mean, navigate to
http://www.oxywater.com.  Don't worry, I own the site and will not be revising
the HTML pages anytime this year, so it won't change.  However, that brings up
another matter that I have not tested.  Those pages are on the same LAN that
I'm on, and perhaps the fast speed caused this problem.  I haven't tested
Mozilla from a remote location to see if the problem disappears.  However, I
doubt that is a factor, but keep it in mind in case you can't reproduce the
bug.  Anyways, once the page has COMPLETELY loaded, move the mouse over the top
menu icon.  You will see the image change.  Then move the mouse down over the
rest.  Repeat this a couple of times and the images should look distorted.  It
looks as if the images redraw themselves a couple of pixels lower and lower
each time causing them to smear.

Have only confirmed this on the Windows 95/NT platform using I386 architecture.

Comment 1

[Mike McCabe]

Reassigning to ImageLib, in the hopes they'll have more of a clue what to do
with it.

Comment 2

[Robert Ginda]

Changing QA Contact to Eli

Comment 3

[pnunn]

This sounds familiar. and it sounds like
a layout bug I've heard about. Reassigning
to Troy. Troy, let me know if you want me
to jump in on this. It may be in gfx.
(adding cc: beard, pnunn)
-pn

adding cc: beard
-pn

Comment 4

[troy]

It appears to just be a painting problem. If the window is covered up and then
exposed it paints correctly

Comment 5

[troy]

This looks fixed with the latest build. I no longer see a problem when moving 
the mouse over the images

Comment 6

[Eli Goldberg]

Verifying as FIXED/WORKSFORME on all platforms. 

I do note a minor cosmetic issue in which a horizontal black line appears 
underneath the most items when dragging the mouse pointer downwards over the 
list.

(Brian, if you'd like to confirm that it's not an issue in your Javascript code, 
please feel free to write a separate bug for that.)