[PyQt] set Vertical Offset in a treeview

[Jake Richards]

Hello:
  I am trying to basically bookmark a spot in a tree view and then return to
it later.  For example, say I'm looking about 1/3 the way down a large tree,
I want to set a bookmark so if I scroll way down to the bottom of the tree
with the scrollbars, I can quickly go back to where I was.  I see the
scrollToItem method and the verticalOffset but I am having trouble with
both.  For scrollToItem, I'm not sure how to get the first visible item in
the current view.  And with verticalOffset, I'm not sure how to use the
offset it returns to set the scrollbars back to where I bookmarked.  Does
anyone know how to accomplish either of these tasks?  Or, is there a better
way?  Thanks!
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