[kmymoney4] [Bug 365177] New: Changing investment fraction doesn't change rounding behavior

[David Chamberlain via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=365177

            Bug ID: 365177
           Summary: Changing investment fraction doesn't change rounding
                    behavior
           Product: kmymoney4
           Version: 4.8.0
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: NOR
         Component: general
          Assignee: kmymoney-devel at kde.org
          Reporter: dc46and2 at gmail.com

Changed the "Fraction" field on the investment details dialog from "1000" to
"10000" so I could accurately record some dividend reinvestment transactions.
On the ledger, the quantity is now shown with 4 decimal places, but any
quantity I enter is still rounded to 3 decimal places.

A workaround is to change the "Fraction", then exit and restart kmymoney before
updating quantities on the ledger.

Reproducible: Always

Steps to Reproduce:
1.Create an investment, accept default "Fraction" of 100
2.Edit the investment and increase the "Fraction" to 1000
3.Open investment account ledger and create a transaction involving the above
investment. Use a quantity with three numbers after the decimal, such as 1.123.

Actual Results:  
The quantity on the ledger will be 1.120.

Expected Results:  
The quantity on the ledger should be 1.123

It appears that the transaction price is correctly calculated using the
unrounded quantity, causing the transaction data recorded in the ledger to be
inconsistent. I.e. Quantity x Share price != Transaction price

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