A minor rev graph nit

Hi Stefan^2,

This is a fairly minor one. Show a revgraph for
doc/source/en/TortoiseSVN/tsvn_basics.xml. Because that file changes
little, most of the tags are copied from the same point.

For r13308 collapse subtrees, and you get a heap of disconnected subtrees.
At this stage, r13308 has box with [o] so you can reconnect them all.
On one of the subtrees, click on [o] to reconnect it.
Now r13308 has no [o] box, so the remaining subtrees are (visually)
orphaned. There is no indication in the main tree that something is
split away. Maybe the [o] should remain on the parent node while there
are still disconnected subtrees.

Also, there are a lot of lines crossing boxes in this view. I don't
see an easy solution to that, unless you permit lines to enter the
box on the left edge as well as the bottom. But you would need an 'S'
curve to connect them that way.

I note that tag folding cleans up the view a lot in this case.

Simon

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