Reimplement QTreeView

[wirasto]

I tried reimplement QTreeView. But in drawBranches I can't use QStyleOptionViewItem for condition...

QStyleOptionViewItem opt=viewOptions();

if (opt.state & QStyle::State_Children){
.....
....
....
}

if (opt.state & QStyle::State_Children){
.....
....
....
}

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