While testing bitcoin/bitcoin#23065 noticed that in context menu of "Coin Selection" dialogue one can copy to clipboard address, label, amount, transaction ID, but not vout, which is also not displayed anywhere. Both txid and vout are needed for lockunspent RPC (I wanted to copy them from GUI, then run RPC command and then check do GUI updates the state).

I propose adding another context menu action that copies either vout or txid:vout to the clipboard.