private void PromoteDupButton_Click(object sender, EventArgs e)
{
TPFTexInfo selected;
TPFTexInfo parent;
int parentIndex = GetParentTex(out parent);
int selectedInd = GetSelectedTex(out selected);
parent.FileDuplicates.Remove(selected);
selected.FileDuplicates = new List<TPFTexInfo>(parent.FileDuplicates);
selected.FileDuplicates.Add(parent);
LoadedTexes[parentIndex] = selected;
RedrawTreeView();
}