Please describe the problem:
When I try to create an Average Balance report using an account that has a reverse balance (Preferences->Accounts->Reverse Balanced Accounts), the report does not seem to be aware of reverse balances.  As a result, the numbers it calculates for a running balance can be way off: the *initial* balance for the graph incorporates the reversal, while the *changes* in balance do not.



Steps to reproduce:
1. Turn on Preferences->Accounts->Reverse Balanced Accounts for some accounts.
2. Create a sample account of the Reverse Balance type.
3. Enter some sample data.
4. Create an Average Balance report with date range starting where the sample account has a 0 balance.
5. Create an Average Balance report with date range starting where the sample account has a non-zero balance.


Actual results:
Running balance for sample account (step 3):
Apr 1: 0.00
May 1: 0.00
Jun 1: 0.70
Jul 1: 1.05
Aug 1: 1.22

Step 4: Reported account balance (daily step size), 4/1-8/1:
Apr 1: 0.00
May 1: 0.00
Jun 1: -0.70
Jul 1: -1.05
Aug 1: -1.22

Step 5: Reported account balance (daily step size), 6/1-8/1:
Jun 1: 0.70
Jul 1: 0.35
Aug 1: 0.18

Expected results:
Ideally, a balance report only involving reversed-balance accounts should also reverse its balance (in the Step 4 data, all numbers should be positive).  As a cruftier solution, the numbers from Step 4 should match those of Step 5 -- the starting amount should be -0.70.

Does this happen every time?
Yes.

Other information: