Wow, its now almost 2 years since Microsoft Customers expressed their irritation at this BUG and its still not fixed. What a way to run a business!
Why is it taking so long?
The left pane scrolling bug is still present in an early release of Windows 8.
If you have tried the Windows 8 Developer Preview (an early version of Windows 8) you will notice that it still scrolls the left pane incorrectly, just as Windows 7 does.
To provide your input on the bug:
Windows 8 Developer Preview thread to discuss the bug:
http://social.msdn.microsoft.com/Forums/en-US/windowsdeveloperpreviewgeneral/thread/e3ed9cb4-5f73-47cc-b08b-9a4bc8efad09
Vote to have the bug fixed at Microsoft Connect:
http://connect.microsoft.com/WindowsServerFeedback/feedback/details/621426/bug-when-expanding-folders-in-explorer-server-2008-r2-and-windows-7
You can see the left pane scroll bug here:
http://www.youtube.com/watch?v=ZGdGoO7Anis
This shows one way to reproduce it, clicking the triangle/arrow to expand a folder you're currently viewing also reproduces it.