Bug: Incorrect currency conversion in holding total return

[ttkjakub]

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Bug description

"Total return" of a holding in an investment account is wrong if trades have different currency from the account itself.

To Reproduce

Steps to reproduce the behavior:

1. Create an investment account in your primary currency (SEK in my case)
2. Add a new trade in a different currency (e.g. buy 1 AAPL for 204 USD - current market price at the time of writing this)
3. Observe that:
4. the total return is wrong (should be around 0 since we bought the stock at the current market price);
5. and that the average cost is shown with a wrong currency symbol

Expected behavior

Currencies should be correct converted when calculating total return of a holding

Screenshots and/or recordings

The following screenshot demonstrates both issues:

• in blue: average cost should show $204 USD (or be correctly converted to SEK)
• in red: total return and trend should be around 0

[Ripwords]

The issue applies to other areas of the application as well, when currencies are mixed, the default account's currency is used regardless of what each transaction's selected currency