There's an "Open channel" entry in History. However, the transaction ID doesn't show up in the blockchain after trying to explore it. ( I abandoned the attempt to open channel with the merchant and I did not sign the transaction).
How could I retrieve my locked funds? It's been forever in locked state.
If it's not showing in the blockchain,
then perhaps it's saved as a "
local transaction" since the server where you're connected to won't see it in its database nor mempool.
The funds should be restored by removing the local transaction from the history (
right-click->remove) or read the next sentence.
For the channel (
or funds), I still haven't found a way to remove those "
bugged channels" that I've created in testnet
but if there's no other active channels in your wallet, you can just create another wallet by restoring your wallet's seed phrase.