Drag'n'frop in vertical alignment works incorrectly (FF 3.6.10)

[GoogleCodeExporter]

== What exact steps will reproduce the problem? ==

1. Set tab bar to be shown along the left edge
2. Open A LOT of tabs, such that scroll bar appears.
3. Scroll down
4. Try dragging the bottom-most tab

== What is the expected output? What do you see instead? ==
Expected: the tab that you drag is placed under the one that you drop it onto; 
blue arrow indicates the place where this tab is placed.
Mouse scroll should scroll the list.

Seen: List scrolls chaoticly, it's impossible to place the tab being dragged in 
the end of the list; blue arrow points in lower than the tab should actually 
go, by the amount by which the list is scrolled. 
Unable to scroll the list using mouse scroll button while dragging.

== What versions of Tab Kit and Firefox are you using? On what operating
system? ==
FF: 3.6.10
Tabkit: 0.6
OS: Windows 7 x64 Pro

== Please provide any additional information below. ==

Original issue reported on code.google.com by susLamo on 29 Sep 2010 at 1:29

Attachments:

• tabkit_bug.jpg

[GoogleCodeExporter]

forgot to mention. everything works fine with TabKit 0.5.12

Original comment by susLamo on 29 Sep 2010 at 3:41

[GoogleCodeExporter]

I can confirm the bug.
Dragging does not work when the scrollbar appears. And this feature worked with 
the previous version.

Original comment by alain.ob...@gmail.com on 1 Oct 2010 at 10:30

[GoogleCodeExporter]

Same here using FF 3.6.12, trying to move a tab to or from the area below 
what's visible without scrolling down is impossible.  The list of tabs shifts 
erratically, up and down, but always seems to land with only the top showing.  
Also, the whole list collapses while dragging a tab down if the list is set to 
window-shade out of the way.  It re-appears if trickled while still dragging 
the tab, but the lower section is still inaccessible for dropping.

Original comment by forsandm...@yahoo.com on 10 Nov 2010 at 6:28