This doesn't answer my question why you not, at least, tried to 
reproduce it on version which i reported as affected version. You 
could tell then that it's an unknown bug which is already fixed in 
your personal version so there's no need to spend more time on it.

Because I didn't realize it was the same bug until you provided the 
further details.  Since the symptoms listed in this bug are NOT the 
same as the symptoms listed in #13218 ... but the underlying cause is 
the same.  Which there would be no way of knowing this unless someone 
actually did the research.

FWIW, all of this is occurring because of #13170 (which you also 
reported).  That issue and this issue are mutually exclusive ... to 
fix both, the code needs to be refactored/rewritten.

And, in this case, it wasn't even a git version.. How am i suppose to 
prove a bug which you already fixed and didn't tell anybody?

Michael, what is the meaning of specifing the version, which is 
affected by a bug, IF you are always trying it on git version? I spent 
HOURS on this only because you were not trying to reproduce it on 
version, which i specified in the report. Thank you for wasting my time.

#13218

I was debugging this for 3 hours (!!!) now and the only thing i was 
able to find out is that there's an additional call to 
'_toggleSubFolder' (javascript) in 6.2beta1 when collapsing a folder. 
I don't know from where it comes or what it is suppose to do (i really 
don't know your code and i won't spend more time with this) but if i 
disable it, everything works fine.

In IMP 6.1, when you collapse a folder, there is only one call to 
'_toggleSubFolder' with mode 'tog'. In 6.2beta1, there are 2 calls to 
'_toggleSubFolder' with modes 'tog' and 'exp' and the second one is 
causing the problem and expanding the folder again.

I don't see this always on regular folders, but only sometimes, namely 
if the selected folder is updated while collapsing the parent. On 
remote accounts this happens always.

More info:
  - it is actually happening also for standard folders, NOT only for 
remote accounts
  - it is NOT happening when using Collapse all
  - when clicking on folder collapse icon, browser is calling two URLs 
(and yes, i'm NOT double-clicking on it):
/services/ajax.php/imp/collapseMailboxes
/services/ajax.php/imp/expandMailboxes

No.  That time is better spent tracing the code and determining where 
the issue is on your side instead, so I can reproduce locally.

Michael, will it help if i create you an account in my installation?

I'm able to reproduce it also on FF29.0.1 + Win7.

Nope.  Still works perfectly here.   Auth to remote account, click on 
remote account Inbox, and I can collapse both the account itself and 
the containing "Remote Accounts" mailbox.  FF29/Win 8.1

Yes, with 'you need to open a folder' i meant you need to click on it 
which will highlight it and shows messages inside it (and keep it like 
this while collapsing remote account).

I see this too, but only if one of the folders inside the remote 
account is highlighted.

Firefox 29.0, Chrome 34.0.1847.116, linux

It is always reproducable - you need to open any folder inside remote 
account and keep it opened while collapsing remote account. The 
folders will collapse but expand again immediately. This is happening 
only with remote accounts, if i do this with other folders, it 
collapses ok (and folder keeps opened).

Can't reproduce.

1.) Autheticate into remote account.
2.) Exapnd it's folders and open any of them.
3.) Try to collapse remote account folders (or whole Remote Accounts).