404502 - Occasional 1 pixel red lines in Google Reader

Status: VERIFIED FIXED

(Core :: Graphics, defect, P2)

Description

[Matthew Wilson]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b1) Gecko/2007110904 Firefox/3.0b1
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b1) Gecko/2007110904 Firefox/3.0b1

In FF 3b1, using Google Reader, I occasionally see what look like single pixel horizontal lines before the items in each title. This did not occur in FF2.

If I zoom in with Text Zoom then the lines disappear.

Reproducible: Sometimes

Steps to Reproduce:
Google account required with feeds configured.
Actual Results:  
Some items (but not all) have inaccurate rendering.

Expected Results:  
Items should render consistently.

Screenshot to follow.

Comment 1

[Matthew Wilson]

Attachment: Screenshot of two feed items, one with the glitch

Comment 2

[Logan Ingalls]

Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9b2pre) Gecko/2007112004 Minefield/3.0b2pre ID:2007112004

I see this, too, and have since I started using the nightly trunk builds about a month ago.  So it's not a recent regression.  (I'm changing OS to All)

Comment 3

[Erik Pasco]

I have the same problem with the 1 pixel (red) line in Google Reader.

Comment 4

[G Davis]

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b2pre) Gecko/2007120805 Minefield/3.0b2pre

Also seeing this in google reader.

Comment 5

[Matthew Wilson]

Still present in FF3 beta 2.

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b2) Gecko/2007121120 Firefox/3.0b2

Comment 6

[Matthew Wilson]

Seems to be caused by one of the background images showing through where normally it does not - a rounding error perhaps?

Comment 7

[Mathieu Pellerin]

Sounds to me like a rounding problem. The css background declaration uses part of an image (http://www.google.com/reader/ui/915561304-card-tb-current.gif) -- a red line is present in the gif image but should normally but left out according to css declaration.

One possible reason for it to be present is that extra pixel line gets added after rounding css value.

Comment 8

[-fullmetaljacket-]

dup of bug 376124?

see https://bugzilla.mozilla.org/show_bug.cgi?id=376124#c29 )

Comment 10

[Sylvain Pasche]

Does it only happen when the page is zoomed?

If that's the case, that may be a dup of bug 403181

Comment 11

[Louise]

I see this red line without doing any page zoom.

Comment 12

[Jon Henry]

Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv:1.9b5pre) Gecko/2008031004 Minefield/3.0b5pre

Requesting blocking1.9? This is easily reproducible on today's nightly build for OS X as well. If I load any feed with a lot of posts (Slashdot, Planet Mozilla) and begin scrolling down by hitting the space bar, I see the red lines almost immediately.

Comment 13

[Ria Klaassen (not reading all bugmail)]

It started with this regression range:
http://bonsai.mozilla.org/cvsquery.cgi?module=PhoenixTinderbox&date=explicit&mindate=1182366840&maxdate=1182369239
but only if I set a minimum font-size (of 13).

Second regression range (more lines, even with default font-size):
http://bonsai.mozilla.org/cvsquery.cgi?module=PhoenixTinderbox&date=explicit&mindate=1185383820&maxdate=1185385559

I couldn't yet reproduce the vertical red lines in Bug 421885, see https://bugzilla.mozilla.org/attachment.cgi?id=308409 

Comment 14

[David Johansen]

Attachment: Example red lines in FF 3 Beta 4

This is is a portion of a screen shot showing the red lines around each of the items when using Beta 4 to view Google Reader.

Comment 15

[David Johansen]

This problem appears to still be happening in Beta 4 but has changed from the original screenshot shown, so I have attached a new screenshot showing the red lines that appear around each item in Google Reader.

Comment 16

[Martijn Wargers (dead)]

I can't reproduce it, fwiw. Someone who can reproduce this, should make a testcase, if possible.

Comment 17

[Martijn Wargers (dead)]

Sorry, I couldn't reproduce it here, but I could reproduce it in bug 421885 with the steps to reproduce. I attached the testcases there, so I'm changing the dependency accordingly.

Comment 18

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

Probably fixed by the patch in bug 421069.

Comment 19

[Vladimir Vukicevic [:vlad] [:vladv] (needinfo me, slow to respond)]

This does indeed seem to be fixed by 421069.  Yay!

Comment 20

[Carsten Book [:Tomcat]]

verified fixed using the steps to reproduce + testcase from bug 421885 and Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9pre) Gecko/2008041323 Minefield/3.0pre ID:2008041323

Comment 21

[Joshua Mitchell (Inactive)]

Issue is Resolved - removing QA-Wanted Keywords - QA-Wanted query clean-up task