This isn't a problem in 3.0 or master, but I'm porting the spreadsheet
data set region to a tree view and ran into this. This line meant to
check whether the function was empty, but instead it calls the function,
resulting in a std::bad_function_call exception.
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Actually the function should be called here. It's asking "should this tree item be the active one?", and if so, it activates it. And this is done via a delayed callback because only after reconstruction is complete, we can reliably detect if a state change happened (and correctly call the on_activate() of the item).
But of course, it makes sense to check if it's set first.