[GNC] coalesce the stock accounts in the report

[Mattia Rizzolo]

Hello,

I own several stocks across multiple brokers, so I have an account
structure that, roughly, looks like this:

Assets
 |- Bank1
 |   |- EUR
 |   |- Stocks EUR
 |       |- AAA
 |       |- BBB
 |       |- CCC
 |- Bank2
     |- EUR
     |- Stocks EUR
         |- BBB

So, in this simple case, I hold 4 different stocks across two brokers,
of which one (BBB) is held in two places at the same time.

In this situation the "Advanced Portfolio" report lists:
    AAA
    BBB
    CCC
    BBB

Duplicating BBB and listing it separately between the accounts.

I get why this might be interesting in some cases, but for my uses I
have really have no interest in having a separated view in this report;
it's actually quite confusing right now as I had cases in the past where
I moved holdings across different brokers (without liquidating the
position, directly moving the titles), and this seems to be recorded
actually as a 100% loss (?!!) in the report.  Sure I can tick the "hide
accounts with no shares" options, but I also had cases where I only
partially moved a position so I still hold some shares in both places.

Any suggestion on what I could do?

Clearly I can't unify the accounts as I do need to keep them separated.

Thank you in advance for your insights!

-- 
regards,
                        Mattia Rizzolo

GPG Key: 66AE 2B4A FCCF 3F52 DA18  4D18 4B04 3FCD B944 4540      .''`.
More about me:  https://mapreri.org                             : :'  :
Launchpad user: https://launchpad.net/~mapreri                  `. `'`
Debian QA page: https://qa.debian.org/developer.php?login=mattia  `-
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