643202 - Theme gradient keeps moving on both sides of open window

Status: RESOLVED DUPLICATE of bug 633282

(Firefox :: Theme, defect)

Description

[Frank]

User-Agent:       Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0
Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0) Gecko/20100101 Firefox/4.0

When scrolling through a website the gradient on both sides of the window constantly move up and down. This gradient is located on the default theme for Windows 7. The theme has a glass look and there is a light grey to dark grey transition. This transition from light to dark is clear cut line. This line moves up and down while scrolling through websites. It's extremely annoying as you see flickering in the corner of your eye thinking there has been an update on your screen, but it is just the line moving in the theme.

Reproducible: Always

Steps to Reproduce:
1. Visit a website
2. Scroll through the website
3. You should notice the line on both sides of the window moving constantly
4. This line stays still if you are not scrolling, you must be scrolling
Actual Results:  
Peforming the steps has the line constantly moving about.

Expected Results:  
The line should not move, it should stay in the same spot.

The theme is the default theme that is included with Firefox on Windows 7. This happens with Firefox 4 RC2 and had happened with Firefox 4 RC1 before I updated. I can't confirm if this happened in Firefox 3 as I used Perona's while using Firefox 3.