132448 - long page below iframe is corrupted

Status: RESOLVED DUPLICATE of bug 126592

(Core Graveyard :: GFX, defect, P2)

Description

[Jeff Rogers]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9) Gecko/20020313
BuildID:    2002031312

When drag-scrolling with the scollbar or line at a time scrolling with keys,
graphic corruption is evident at a certain point.  Scrolling by pages (so that
the area appears on screen all at once) does not produce the problem, and
refreshing clears it up.

Reproducible: Always
Steps to Reproduce:
1. Navigate to 
http://boards.station.sony.com/ubb/everquest/Forum3/HTML/024072.html
(or any other topic with a large number of posts, more than 40 or so)
2. drag scrollbar down to bottom of page


Actual Results:  Graphic garbage appears onscreen, for the space of several
lines worth of text.  The location of this garbage is very regular, always
appearing at the exact same place within a page, and generally seeming to come
at about the 37th or 38th comment on those UBB pages.

Expected Results:  normal display

Refreshing the display (xrefresh, switching tabs, or similar) clears up the
garbage.  Scrolling by full pages (pgup/pgdn) does not cause the corruption.

Comment 1

[Andrew Schultz]

Attachment: screenshot of bad behavior

Comment 2

[Andrew Schultz]

Attachment: testcase

just an iframe and a long page below it.  0.9.7 and 0.9.8 do not handle this
properly, but display a blank area where build 20020321 displays garbage.

Comment 3

[Andrew Schultz]

this is probably Compositor rather than Layout.

Comment 4

[Andrew Schultz]

over to Compositor

Comment 5

[Andrew Schultz]

*** Bug 150387 has been marked as a duplicate of this bug. ***

Comment 6

[Jaagup Irve]

I was about to make a dupe of this one. I'm listing those steps bebause the
cause is a bit different this time.

This is reproducible on my machine (running Moz 1.1alpha), but it needs some
tweaking to get right.

1. Open http://bugzilla.mozilla.org/show_bug.cgi?id=1777 in Mozilla, wait until
it loads.

2. Make sure that Mozilla is being run windowed and resize the window so that
the CC list's scrollbar will be off screen.

3. Go down the page (Shift+Down for example)

4. Press and hold up arrow to scroll upwards

Upon reaching Comment #170 some garbage will be shown on right side of screen.
(There are some more, but one is enough I suppose)

Note that this bug will not occur if the window is being scrolled with mouse. It
seems that horizontal scrollbars that are "outside" the window are the cause of
the bug in my case.

Comment 7

[Chu Alan #2]

related to bug 120280?

Comment 8

[Andrew Schultz]

*** Bug 159556 has been marked as a duplicate of this bug. ***

Comment 9

[Andrew Schultz]

from bug 159556:
the magic number here is 65536 pixels (2^16).  the page is again corrupted at
2*65536, 3*65536, etc.

resummarizing and taking URL from bug 159556 since the one here is no longer valid.

Comment 10

[Andrew Schultz]

*** Bug 164369 has been marked as a duplicate of this bug. ***

Comment 11

[Andrew Schultz]

from bug 164369: the display is corrupted with a long page above an iframe.

Comment 12

[peter_c60]

Bug 164369 doesn't look to me like it is a dupe - for a start the page given is
less than 65536 pixels so it could not be caused by the same problem, also I
could  not reproduce the problem in that bug on my machine (details on my
machine found in bug 159556).

Comment 13

[Scott Gifford]

Peter -

  As far as not being able to reproduce the problem in bug 164369: Have you
tried the copy of the page in the ZIPfile?  It seems Salon has changed the
original page so it no longer uses iframe's, and I can't reproduce it anymore
either with their original page, but both [e-mail] and I were able
to see the corruption with recent builds using the ZIPped version of the page.

Comment 14

[peter_c60]

Doh, I didn't try the zip file. Anyway when I tried the zip file the problem
occurred but in a different place. For me the corruption appeared on the word
"fighting" just before the subheading "War".

Comment 15

[Andrew Schultz]

see bug 164369 comment 10

Comment 16

[Andrew Schultz]

*** Bug 164594 has been marked as a duplicate of this bug. ***

Comment 17

[Wily Yuen]

I just downloaded the 1.1 release for Linux build 20020826.
The bug still persists.

Strangly, this bug is not present in 1.0 release

Comment 18

[Wily Yuen]

The URL to show this bug is not working for me. Try
http://www.bluesnews.com

Comment 19

[Andrew Schultz]

I can reproduce the bad behavior with the testcase and the URL with 1.0,
although it does seem to take a bit more persistence.  The bug actually started
a few months before 1.0.

Comment 20

[Andrew Schultz]

*** Bug 122063 has been marked as a duplicate of this bug. ***

Comment 21

[Andrew Schultz]

OS=>All from bug 122063

Comment 22

[Cees T.]

I see some corruption in this testcase (it even showed an enlarged icon from my
systray when I selected the text in the corrupted area) on Windows ME with trunk
2002081808. And also corruption *above* an iframe in the testcase of bug 122063.

Comment 23

[Andrew Schultz]

yes, the the corruption occurs above and below the iframe, and even multiple
times (at equally spaced intervals).  There is a 16-bit integer somewhere that
needs to be 32-bit.

Comment 24

[Cees T.]

And bug 75214 covers garbage inside iframes.

Comment 25

[gavin long]

*** Bug 164556 has been marked as a duplicate of this bug. ***

Comment 26

[Andrew Schultz]

I can't reproduce this bug or its dupes (including bug 164369).  I think it got
fixed by bug 164625.
Could someone test this with a build after 2002-08-30?

Comment 27

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

*** This bug has been marked as a duplicate of 126592 ***

Comment 28

[Ere Maijala (slow)]

*** Bug 167360 has been marked as a duplicate of this bug. ***