User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b12pre) Gecko/20110220 Firefox/4.0b12pre Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b12pre) Gecko/20110220 Firefox/4.0b12pre When i start to drag a tab it immediately closes the expanded view of stacked groups and thus i cannot rearrange tabs within that group. Reproducible: Always Steps to Reproduce: 1. Create a group with a bunch of tabs 2. Resize it until it becomes a stack 3. Open the expanded view for that stack 4. Try to rearrange a tab within that group

Confirmed on nightly: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b12pre) Gecko/20110220 Firefox/4.0b12pre This is a regression.

(In reply to comment #1) > Confirmed on nightly: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; > rv:2.0b12pre) Gecko/20110220 Firefox/4.0b12pre > > This is a regression. Really? I didn't think we ever supported this. Seems like a feature request, but for post Fx4.

(In reply to comment #2) > (In reply to comment #1) > > Confirmed on nightly: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; > > rv:2.0b12pre) Gecko/20110220 Firefox/4.0b12pre > > > > This is a regression. > > Really? I didn't think we ever supported this. Seems like a feature request, > but for post Fx4. I was under the impression that we did, but perhaps I'm mistaken. I agree we can punt on this, though.