fix start value of Portfolio chart

as portfolio.getTransactions is not sorted by default
Issue : #3969

name.abuchen.portfolio.ui/src/name/abuchen/portfolio/ui/views/PortfolioBalanceChart.java

@@ -6,6 +6,7 @@
 import java.time.LocalDate;
 import java.time.temporal.ChronoUnit;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.EnumSet;
 import java.util.List;
 
@@ -29,6 +30,7 @@
 import name.abuchen.portfolio.model.Client;
 import name.abuchen.portfolio.model.Portfolio;
 import name.abuchen.portfolio.model.PortfolioTransaction;
+import name.abuchen.portfolio.model.Transaction;
 import name.abuchen.portfolio.money.CurrencyConverter;
 import name.abuchen.portfolio.money.CurrencyConverterImpl;
 import name.abuchen.portfolio.money.ExchangeRateProviderFactory;
@@ -147,6 +149,8 @@ private void computeChart()
         if (tx.isEmpty())
             return;
 
+        Collections.sort(tx, Transaction.BY_DATE);
+
         LocalDate now = LocalDate.now();
         LocalDate start = tx.get(0).getDateTime().toLocalDate();
         LocalDate end = tx.get(tx.size() - 1).getDateTime().toLocalDate();