122193 - Sometimes fixed positioned elements leave cruft when scrolling

Status: VERIFIED DUPLICATE of bug 93526

(Core Graveyard :: GFX, defect, P3)

Description

[Greg K.]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-US; rv:0.9.7) Gecko/20011221
BuildID:    2001122106

Sometimes absolutely positioned elements leave cruft on the screen after scrolling.

Reproducible: Sometimes
Steps to Reproduce:
1. Access the specified URI

Actual Results:  Perhaps 10% of the time, the absolutely positioned element at
top-left will leave cruft after scrolling down, then back up.

Expected Results:  The absolutely positioned element should leave no cruft.

I regret being unable to attach a very simplified test case at this time. I will
create a URI without the onload JavaScript, which will help performance, but my
attempts to produce a simplified test case have been in vain thus far.

Comment 1

[Christopher Aillon (sabbatical, not receiving bugmail)]

There is a difference between absolutely positioned elements and fixed elements.

Because of the nature of this, I am pretty sure this is a dupe of bug 100536
which is quite similar and lately I get that problem at about the same ratio.

Comment 2

[Christopher Aillon (sabbatical, not receiving bugmail)]

.

Comment 3

[Greg K.]

Altering URI to point to a version of the problem file with onload JavaScript
disabled.

Note also that bug 122192 deals with another problem on the same document.

Comment 4

[Nick Kocharhook]

Although I was not able to reproduce the cruft, the description you provide
looks to me like a dupe of bug 93526.

I would say that bug 93526 is more appropriate than bug 100536 because it deals
with elements on tha page, rather than in sidebars. However, perhaps these are
all three the same bug.

Mozilla build 2001122106, 0.9.7 release, Mac OS X.

Comment 5

[Greg K.]

In trying to reproduce, be sure to reload at least ten times if you fail to
encounter the cruft.

In fact, you may to reload more times than that. If you're going to encounter
it, you almost certainly should within twenty tries.

Comment 6

[Boris Zbarsky [:bzbarsky]]

Compositor.

Comment 7

[Kevin McCluskey (gone)]

Bulk moving Moz1.2 bugs to future-P3. I will pull from this list when scheduling
post Mozilla1.0 work.

Comment 8

[Boris Zbarsky [:bzbarsky]]

almost certainly a dup

Comment 9

[Greg K.]

Boris is right.

*** This bug has been marked as a duplicate of 93526 ***