[PyQt] QTreeView (and QTreeWidget) horizontal scroll bar jumping

[Thomi Richards]

Hi,

I have an application with a tree view that has a rather large tree inside
it. I've tweaked the tree view header so the tree view's horizontal
scrollbar works as I'd like, as documented here:

http://qt-project.org/faq/answer/how_can_i_ensure_that_a_horizontal_scrollbar_and_not_an_ellipse_shows_up_wh

However, I notice that when I use the arrow keys to navigate a tree view,
every time I press the "Down" arrow on the keyboard to select a new tree
view item, the horizontal scrollbar resets itself to show the
left-hand-most content in the view.

I have a minimal example that shows the problem:

http://paste.ubuntu.com/7214797/

Run it, expand the tree with the arrow keys till it's off the right-hand
edge of the window. Move the scrollbar to the right, and try moving around
with the keyboard.

Ideally, the horizontal scrollbar would move left/right to keep the
currently selected item's text in view.

Does anyone know if this can be achieved? I imagine I'd need to override or
set something in QAbstractItemView, but the documentation for that class
seems rather opaque to me.

Cheers,

-- 
Thomi Richards
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