gui: Add 'Watch Only' Support for Asset Balances

[m4r1m0]

Running on Ubuntu 20.04 using raven-4.7.0test3-b5010492c (64 bit).

Testing P2SH for Assets and discovered that assets sent to a P2SH address will not display in your 'Watch only' list.

RVN balances display correctly in a separate column for P2SH addresses.

I suggest adding Asset Balances to the 'Watch only' list in a separate column from spendable wallet balances.

Above you can see my transaction list with various asset and RVN transaction to P2SH address '2NG5F15LVeYtyKmTeQ44HTrkY5iSLZTKrvB' which has been added to 'Watch only' via the importaddress command.

And here you can see my wallet balances page. Notice that RVN balances are displaying correctly whereas Asset Balances remains blank despite multiple transfers of "KINKAJOUCOIN" to P2SH address '2NG5F15LVeYtyKmTeQ44HTrkY5iSLZTKrvB'.

[m4r1m0]

Title changed because further testing reveals there is no 'Watch only' functionality for Asset Balances of P2PKH addresses either.

Suggest that this feature be added for all supported address types.

[lsji07]

The way I understand adding a P2SH address to watch was via importmulti with the relevant P2PK addresses involved. Not tested if this works but that would be the behaviour I would expect.

[m4r1m0]

The way I understand adding a P2SH address to watch was via importmulti with the relevant P2PK addresses involved. Not tested if this works but that would be the behaviour I would expect.

I'll try that. However, importaddress works for adding P2SH RVN balances to the 'Watch only' list, and there is no 'Watch only' list for P2PKH Assets either (added via importaddress) which leads me to believe that adding this feature for Asset Balances may have simply been overlooked.