559919 - Message renders streaks and other horizontal artifacts under certain conditions

Status: RESOLVED DUPLICATE of bug 547654

(Thunderbird :: Mail Window Front End, defect)

Description

[Saul Tannenbaum]

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3
Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.5pre) Gecko/20100416 Lightning/1.0b2pre Lanikai/3.1b2pre

For some messages, Thunderbird renders the text with streaky horizontal artifacts, similar to what you might get if the message were being printed out on an inkjet printer. As a minimum condition, the message must extend beyond the message pane and thus be scrollable. 

Reproducible: Always

Steps to Reproduce:
1.Display a message similar to the one attached.
2.
3.
Actual Results:  
A badly rendered message appears. If the Thunderbird window is sent to the background then brought back to the foreground the rendering is fixed.

Expected Results:  
A well rendered message appears.

I have been unable to fully determine what characteristics a message must have to to trigger this issue but will attach one that does. It happens to be a multi-part mime message.

This issue appeared within the last couple of weeks of nightly builds. 

A screenshot and sample message is attached.

Comment 1

[Saul Tannenbaum]

Attachment: Sample message that doesn't render correctly (with headers removed)

Comment 2

[Saul Tannenbaum]

Attachment: Screenshot of rendering problem