547860 - Reftests line-editing-1a.html through line-editing-1e.html fail on Ubuntu 9.10

Status: NEW

(Core :: Layout: Text and Fonts, defect)

Description

[Daniel Holbert [:dholbert]]

I get failures on these reftests on my Linux desktop (running Ubuntu 9.10 Karmic)
> layout/reftests/text/line-editing-1a.html
> layout/reftests/text/line-editing-1b.html
> layout/reftests/text/line-editing-1c.html
> layout/reftests/text/line-editing-1d.html
> layout/reftests/text/line-editing-1e.html

Attaching failure log (suitable for feeding to reftest-analyzer.xhtml). 
Each reftest has 1px of difference, except for test '1d', which has 3px of difference.  The differing pixels all seem to be turquoise pixels at the bottom-right edge of a replaced 'X' character. (probably from antialiasing?)

Comment 1

[Daniel Holbert [:dholbert]]

FWIW, I'm using 'subpixel smoothing' on fonts, in the gnome "Appearance Properties" dialog's "Fonts" tab.  (I believe this was the default setting.)  That's probably what's responsible for the pixel being blue.

Comment 2

[Daniel Holbert [:dholbert]]

Attachment: reftest failure log (with subpixel smoothing)

Comment 3

[Daniel Holbert [:dholbert]]

Attachment: reftest failure log (no subpixel smoothing)

Here's the reftest failure log, when I run with subpixel smoothing disabled. (I changed "Rendering" to "Monochrome", in Fonts tab of gnome-appearance-properties)

Still fails, but with a single gray pixel instead of a turquoise/blue pixel.

Comment 4

[Daniel Holbert [:dholbert]]

FWIW, I tried reverting Bug 539925 (which made a minor tweak to these reftests), and that didn't fix the problem.  So, this issue dates back to the creation of these reftests, in bug 504524.