631351 - With an open messages, scrolling with the Magic Trackpad smears or breaks the text.

Status: RESOLVED WORKSFORME

(Thunderbird :: OS Integration, defect)

Description

[spr]

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_6; en-us) AppleWebKit/533.19.4 (KHTML, like Gecko) Version/5.0.3 Safari/533.19.4
Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.13) Gecko/20101207 Thunderbird/3.1.7

I don't see this problem on other software, including Apple Mail. 

Using my trackball does not create this problem.

Reproducible: Always

Steps to Reproduce:
1.Open a message
2.Scroll down
3.
Actual Results:  
Vertically smeared or broken text display.

Expected Results:  
Scrolling with undamaged text.

Machine is new (late 2010) Mac Pro with 6G RAM, system 10.6.6.

Comment 1

[Ludovic Hirlimann [:Usul]]

Do you have extension installed ?

Comment 2

[Daniel Veditz [:dveditz]]

I see something like this too, Mac OS X 10.5.8. Started only a couple of days ago at most (Tbird 3.1.8 beta) and only happens on text/plain mail (which is the bulk of my mail, e.g. bugzilla spam). When I use the arrow keys to scroll there are subtle artifacts, using the scroll bar makes it really smear.

When I unchecked the "use fixed width font for plain text" option the problem went away. When I re-checked that option it seems to have stayed OK so far, hasn't come back.

Comment 3

[Daniel Veditz [:dveditz]]

Well, the "fix"/workaround didn't last long. A few hours later and again I'm getting smeared text as I scroll in plain text mail.

Comment 4

[Andrew Sutherland [:asuth] (he/him)]

This sounds really likely to be a (mozilla) platform issue, although I could believe we are doing something unique that causes layout to perceive our bounding box as a pixel or two different from what it otherwise is so that any fastpath blitting causes smearing...

If you do things that should cause a repaint from first principles (presumably resizing the window or moving a splitter), I assume everything instantly goes back to crisp?

Comment 5

[Wayne Mery (:wsmwk)]

spr, dveditz, do you still see this?

To quote from comment 4 ... If you do things that should cause a repaint from first principles (presumably resizing the window or moving a splitter), I assume everything instantly goes back to crisp?

Comment 6

[Daniel Veditz [:dveditz]]

Haven't seen this is years.