632699 - Windows Taskbar Tab Previews and Tab Groups don't get along well

Status: RESOLVED DUPLICATE of bug 591434

(Firefox Graveyard :: Panorama, defect)

Description

[David]

User-Agent:       Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b11) Gecko/20100101 Firefox/4.0b11
Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b11) Gecko/20100101 Firefox/4.0b11

Previewing a tab with Windows Taskbar Tab Previews that is not in the current Tab Group will add tabs from other tab groups to the tab bar. Clicking the foreign tab will cause me to switch tab groups. There are no residual tabs left on the group that was left behind.
I am unsure if this is expected behavior.

Reproducible: Always

Steps to Reproduce:
1. Make sure "Show tab previews in the Windows taskbar" is enabled.
2. Open a bunch of tabs.
3. Separate tabs into groups.
4. Switch to a group where it'd be easy to notice an influx of new tabs.
5. Mouse over Firefox icon in the taskbar.
6. Mouse over each entry in the preview pane.
Actual Results:  
A bunch of tabs from other groups will appear in your tab bar. Clicking one of these tabs will switch you to the group that tab should be in (even if the tab belongs to the group you started in). 

Expected Results:  
No new tabs should be appearing in the tab bar.