596946 - horizontal lines while scrolling up the message pane

Status: RESOLVED INCOMPLETE

(Thunderbird :: Message Reader UI, defect)

Description

[Kleppten]

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_4; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.55 Safari/534.3
Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; de; rv:1.9.2.9) Gecko/20100825 Thunderbird/3.1.3

if i scroll up the mail, shown in a message pane, horizontal lines garble the display. appears only with linewise scrolling NOT page wise

Reproducible: Always

Steps to Reproduce:
1. to to mail in preview 
2. scroll down with trackpad
3. get annoyed
Actual Results:  
horizontal lines bug me up, again and again

Expected Results:  
seen clear scrolling mail

No additional themes are used, just the standard theme, 
mac os 10.6. snowleopard, mac book pro 13"

Comment 1

[Michael A. Pasek]

For all other occurrences, the problem goes away when (certain) extensions are disabled.  Try starting TB in "Safe Mode": http://kb.mozillazine.org/Safe_mode

Comment 2

[Decathlon]

Lightning extension caused a similar problem only on Mac.
It has been fixed by changing some css properties for a button (the "today-pane" button) that the extension puts in the status bar. See Bug 547654.

Comment 3

[Peep Chaintreuil]

Note, even when one starts in safe mode, one still gets the following warning:

2011-07-23 07:34:42.227 thunderbird-bin[260:1403] -deviceDeltaX is deprecated for NSScrollWheel. Please use -scrollingDeltaX.

Comment 4

[Wayne Mery (:wsmwk)]

Kleppten do you still see this problem?


Decathlon, do you still see the lightning problem?

(In reply to Decathlon from comment #2)
> Lightning extension caused a similar problem only on Mac.
> It has been fixed by changing some css properties for a button (the
> "today-pane" button) that the extension puts in the status bar. See Bug
> 547654.

Comment 5

[Decathlon]

(In reply to Wayne Mery (:wsmwk) from comment #4)

> Decathlon, do you still see the lightning problem?
> 
> (In reply to Decathlon from comment #2)
> > Lightning extension caused a similar problem only on Mac.
> > It has been fixed by changing some css properties for a button (the
> > "today-pane" button) that the extension puts in the status bar. See Bug
> > 547654.

Actually I never saw the problem because I don't use the Mac. I only reported the problem that seemed caused by something that changed in an anomalous way the message pane size.

In bug 547654 it was the Lightning's today-pane button, but there are other reports, e.g. in the Mozilla Italia forum a very similar problem seemed caused by the addon Display Mail User Agent http://forum.mozillaitalia.org
/index.php?topic=46875.msg302098#msg302098.

A few days ago (14/12/2011 http://forum.mozillaitalia.org/index.php?topic=46875.msg349063#msg349063) the user "Winfox" says that the problem still appears in a random way, with no precise cause. He says that the only way to make the text readable is scrolling with the mouse wheel instead of scrolling with two fingers on the Mac's touch-pad.

Comment 6

[Wayne Mery (:wsmwk)]

iirc there is a different bug or two already filed about swip problems