detecting tree searches

[Dave Howorth <dhoworth mrc-lmb cam ac uk>]

My application takes actions when a different row is selected in a
TreeView (based on the TreeSelection changed signal). But I want to
distinguish those cases where the selection changes because the user is
typing in a search key. Is there any way to tell when a search is in
progress?

I've noticed the start-interactive-search signal but I haven't found
something to tell me when the search finishes.

Thanks, Dave