fix export from settings tabs for new account by ensuring bidirectional links are restored on save

src/main/java/com/sparrowwallet/sparrow/wallet/SettingsController.java

@@ -458,18 +458,10 @@ public class SettingsController extends WalletFormController implements Initiali
         }
 
         Optional<Wallet> optWallet = AppServices.get().getOpenWallets().entrySet().stream()
-                .filter(entry -> walletForm.getWalletFile().equals(entry.getValue().getWalletFile()) && entry.getKey().isMasterWallet()).map(Map.Entry::getKey).findFirst();
+                .filter(entry -> walletForm.getWalletFile().equals(entry.getValue().getWalletFile())
+                        && entry.getKey().getName().equals(walletForm.getWallet().getName())).map(Map.Entry::getKey).findFirst();
         if(optWallet.isPresent()) {
-            Wallet wallet = optWallet.get();
-            if(!walletForm.getWallet().getName().equals(wallet.getName())) {
-                wallet = wallet.getChildWallet(walletForm.getWallet().getName());
-            }
-
-            if(wallet == null) {
-                throw new IllegalStateException("Cannot find child wallet " + walletForm.getWallet().getFullDisplayName() + " to export");
-            }
-
-            WalletExportDialog dlg = new WalletExportDialog(wallet);
+            WalletExportDialog dlg = new WalletExportDialog(optWallet.get());
             dlg.showAndWait();
         } else {
             AppServices.showErrorDialog("Cannot export wallet", "Wallet cannot be exported, please save it first.");

src/main/java/com/sparrowwallet/sparrow/wallet/SettingsWalletForm.java

@@ -60,15 +60,21 @@ public class SettingsWalletForm extends WalletForm {
             //Clear node tree, detaching and saving any labels from the existing wallet
             walletCopy.clearNodes(wallet);
 
+            //Retrieve master or child wallets from current active wallet before overwriting
+            Wallet masterWallet = wallet.isMasterWallet() ? null : wallet.getMasterWallet();
             Integer childIndex = wallet.isMasterWallet() ? null : wallet.getMasterWallet().getChildWallets().indexOf(wallet);
+            List<Wallet> childWallets = wallet.getChildWallets();
 
             //Replace the SettingsWalletForm wallet reference - note that this reference is only shared with the WalletForm wallet with WalletAddressesChangedEvent below
             wallet = walletCopy.copy();
 
+            //Restore bidirectional links between original master or child wallets
             if(wallet.isMasterWallet()) {
+                wallet.setChildWallets(childWallets);
                 wallet.getChildWallets().forEach(childWallet -> childWallet.setMasterWallet(wallet));
-            } else if(childIndex != null) {
-                wallet.getMasterWallet().getChildWallets().set(childIndex, wallet);
+            } else if(masterWallet != null && childIndex != null) {
+                wallet.setMasterWallet(masterWallet);
+                masterWallet.getChildWallets().set(childIndex, wallet);
             }
 
             save();