[Bug 244635] [NEW] scrollboxes scroll to offset 0 when resized

[mnemo]

Public bug reported:

1. install thunderbird (I used 2.0.0.14 for this repro)
2. create a large set of local folders so that you have about two screenfulls of local folders
3. select the top "inbox" node
4. scroll the list of local folders to the bottom
5. resize the local folders panel to be a little bit bigger

Expected:
I just want to resize it, I don't want it to change the scroller position as a side effect,

Actual:
The scrollbox/panel that contains the local folder will automatic scroll to offset 0 making the selected "inbox" item visible again.


Note: I think this is a bug in the mozilla platform or whatever because
I see the same buggy effect when I create a large amount of filter rules
inside the "Tools::Message Filters" dialog (to repro the bug in there I
just create two screenfulls of filter rules (about 60 or so) and then
select the first rule, scroll to the bottom and then resize the entire
"Message Filters" dialog window.

** Affects: thunderbird
     Importance: Unknown
         Status: Unknown

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: New

** Bug watch added: Mozilla Bugzilla #442991
   https://bugzilla.mozilla.org/show_bug.cgi?id=442991

** Also affects: thunderbird via
   https://bugzilla.mozilla.org/show_bug.cgi?id=442991
   Importance: Unknown
       Status: Unknown

-- 
scrollboxes scroll to offset 0 when resized
https://bugs.launchpad.net/bugs/244635
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