[GUI][Cold Staking] Re-spends display strange in the Qt wallet.

[CaveSpectre11]

May be a additional test case for #1275 and root cause duplicate of #1270.

Describe the issue

Cold staking transactions that are spends of previous cold staking transactions show strange in the staking wallet.

Can you reliably reproduce the issue?

I have not tried, however the chain of events should be reproducible.

Expected behavior

Not really sure what I would expect to see in this situation. Perhaps the additional adds not being red would be enough; but it took some study to understand why one 1000 PIV UTXO is in my transactions as 3.

Actual behavior

The first stake delegation is displayed as a gray positive amount.
The second stake delegation (that included the first as an input) is displayed as a red positive amount that was added.
Third stake delegation also shows red and the additional amount.

As you can see from the screenshots below:

1. 10 PIV delegated
2. 500 PIV delegated (490 additional, displayed red, 10 PIV from previous delegation used as input)
3. 1000 PIV delegated (500 additional, displayed red, 500 from previous delegation used as input)

Screenshots.

What version of PIVX Core are you using?

v4.0.2

Machine specs:

• OS:
• CPU:
• RAM:
• Disk size:
• Disk Type (HD/SDD):

Any extra information that might be useful in the debugging process.

This is normally the contents of a debug.log, db.log or config.log file. Raw text or a link to a pastebin type site are preferred.