I don't particularly like the timeout, but ok.

I had similar thoughts, but do you have any suggestions about avoiding this? StBoxLayout has no methods enabling the actual position of one of its contained actors to be determined, if more than one has been inserted with the same position request (the last one to be inserted wins). If there is a divergence between actual position and requested position, the favorites menu may not move to the position requested if the user requests a change - the extension may think it is already there. One could avoid this by doing a reinsert even when there would apparently be no explicit move, but that has its own disadvantages.