Bug 212918

Summary: FF2 off-by-one rendering error (redraw with dynamic content? text only?)
Product: [Fedora] Fedora Reporter: Nicholas Miell <nmiell>
Component: firefoxAssignee: Christopher Aillon <caillon>
Status: CLOSED CANTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: mcepl, mcepl, wtogami
Target Milestone: ---   
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Hardware: All   
OS: Linux   
Whiteboard: FF3RawhideClose
Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2007-12-20 16:46:58 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
example rendering error none

Description Nicholas Miell 2006-10-30 03:54:02 UTC 
I'm seeing off-by-one rendering errors when page content is redrawn. The easiest
reproducible test-case I've found so far involves the Google Reader component
for Google's personalized homepage.

This is with firefox-2.0-2.fc7.x86_64 on FC6.
It still happens with MOZ_DISABLE_PANGO.


Steps to Reproduce:
1. Create a Google personalized homepage, add the Google Reader widget,
subscribe to some feeds in Google Reader so that you have something to click on
in the Reader widget.
2. Click on something in the reader widget.
3. At this point, text to the left of the feed item bubble is probably mangled,
if not, click elsewhere in the page to dismiss it.
4. At this point, text to the left of where the feed item bubble used to be is
definitely mangled.

Actual Results:
Irritating off-by-one rendering errors.

Expected Results:
Beautiful serene page layout.
Comment 1 Nicholas Miell 2006-10-30 03:54:03 UTC 
Created attachment 139693 [details]
example rendering error
Comment 2 Nicholas Miell 2006-10-31 06:28:19 UTC 
OK, I'm seeing text corruption on static pages when scrolling, so this isn't
limited to dynamic content.

Looks like something similar to the problem that plagued Mozilla from day one
until post-Firefox 1.0 has resurfaced (or been reinvented). I'd hoped that
cross-platform cairo usage would've shaken these bugs out...
Comment 3 Christopher Aillon 2006-10-31 06:46:00 UTC 
The cairo in FF2 is just for SVG only.  Full blown cairo is part of Firefox 3.0.
Comment 4 Nicholas Miell 2006-11-08 06:07:43 UTC 
I just now finally saw something which I am absolutely sure is image corruption,
so this isn't just limited to text.
Comment 5 Matěj Cepl 2007-12-20 16:46:58 UTC 
We just updated the Firefox version in Fedora/development from 2.0 to a 3.0
pre-release version, which improves performance, memory usage, and fixes many
bugs and crashes.

Closing as CANTFIX since we aren't fixing bugs filed against 2.0 now that 3.0 is
in.  If this bug is still present in rawhide using a Firefox 3.0 version, please
re-open this bug.

Thanks and Happy Holidays