[TSVN] Keyboard focus in repository browser

Hi,

A few days ago, someone mentioned that the keyboard handling in the
repository browser wasn't optimal.
After expanding a subtree, the root-item would be selected, so you'd
have to scroll down all the way to your original position again.

This patch deals with this symptom.

NOTE, I wouldn't call it a fix, since I don't know (yet) the root
cause of this problem. It is merely a work-around.

- George

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