Raw transaction import shows unsigned message as signed

[MidnightLightning]

Description

Given the raw transaction (a purchase for https://orbital.market/currencies):

02000000018ba1eda18e9e6258af5cb2856afd64b37f686466c224dc3e83a7577024eca1040000000000ffffffff03ac080000000000001600141656290687674fdd8d614f6b883cf77b531bc09400000000000000000c6a0adcb9bd97ffa4bf732b030df3210000000000160014511c3258e43f112c211a3ca9a548214c8ebfdd2000000000

Importing that into Electrum 4.6.1 via Tools > Load Transaction > From Text, it shows a transaction dialog box, but the "Status" is already "Signed" and the "Sign" button is greyed out.

That is incorrect; the transaction is currently unsigned and I want to create a signature and broadcast it, but cannot because the button is greyed out. The active wallet is a standard p2wpkh wallet, using a Trezor hardware wallet.

[SomberNight]

This is a design decision. It is not a bug.
Anything that parses as a valid transaction but is not in PSBT format is considered "signed" in this context. To be able to correctly tell, we would need a full-blown script interpreter and access to the parent txs.

You need to convert it to a PSBT and import that.
If needed, you can probably do the conversion using the Qt console, but I can't test that now.
Something like this:

from electrum.transaction import PartialTransaction, tx_from_any
PartialTransaction.from_tx(tx_from_any(xxxxxxxx)).serialize()

[MidnightLightning]

This is a design decision. It is not a bug.
Anything that parses as a valid transaction but is not in PSBT format is considered "signed" in this context.

Thanks @SomberNight for that detail. In that case, I'd recommend some sort of notice to the user; some sort of indicator by the "Status: Signed" that indicates it's an assumption, and suggesting they convert the transaction to PSBT format?

I'll try converting the transaction data to PSBT format and see how that goes.

[MidnightLightning]

For anyone attempting to do this for their own transaction, the proper syntax to convert to PSBT in the console is:

from electrum.transaction import PartialTransaction, tx_from_any; print(PartialTransaction.from_tx(tx_from_any("0102030405...")).serialize())