suggest configuring a custom wallets directory when opening a wallet from a non-default location

src/main/java/com/sparrowwallet/sparrow/AppController.java

@@ -1140,12 +1140,37 @@ public class AppController implements Initializable {
         AppServices.moveToActiveWindowScreen(window, 800, 450);
         List<File> files = fileChooser.showOpenMultipleDialog(window);
         if(files != null) {
+            configureWalletsDir(files);
             for(File file : files) {
                 openWalletFile(file, forceSameWindow);
             }
         }
     }
 
+    private static void configureWalletsDir(List<File> files) {
+        List<File> parentDirs = files.stream().map(File::getParentFile).distinct().collect(Collectors.toList());
+        if(parentDirs.size() == 1 && !Boolean.FALSE.equals(Config.get().getSuggestChangeWalletsDir())) {
+            File selectedDir = parentDirs.getFirst();
+            boolean sameDir;
+            try {
+                sameDir = Files.isSameFile(selectedDir.toPath(), Storage.getWalletsDir().toPath());
+            } catch(IOException e) {
+                sameDir = selectedDir.toPath().normalize().equals(Storage.getWalletsDir().toPath().normalize());
+            }
+            if(!sameDir) {
+                ConfirmationAlert alert = new ConfirmationAlert("Change wallets directory?",
+                    "Do you want to configure Sparrow to use " + selectedDir + " as the default wallets directory?", ButtonType.NO, ButtonType.YES);
+                Optional<ButtonType> optType = alert.showAndWait();
+                if(optType.isPresent() && optType.get() == ButtonType.YES) {
+                    Config.get().setWalletsDir(selectedDir);
+                    Config.get().setSuggestChangeWalletsDir(null);
+                } else if(alert.isDontAskAgain()) {
+                    Config.get().setSuggestChangeWalletsDir(Boolean.FALSE);
+                }
+            }
+        }
+    }
+
     public void openWalletFile(File file, boolean forceSameWindow) {
         try {
             Storage storage = new Storage(file);

src/main/java/com/sparrowwallet/sparrow/io/Config.java

@@ -59,6 +59,8 @@ public class Config {
     private Boolean connectToBroadcast;
     private Boolean connectToResolve;
     private Boolean suggestSendToMany;
+    private Boolean suggestChangeWalletsDir;
+    private File walletsDir;
     private List<File> recentWalletFiles;
     private Integer keyDerivationPeriod;
     private long dustAttackThreshold = DUST_ATTACK_THRESHOLD_SATS;
@@ -406,6 +408,24 @@ public class Config {
         flush();
     }
 
+    public Boolean getSuggestChangeWalletsDir() {
+        return suggestChangeWalletsDir;
+    }
+
+    public void setSuggestChangeWalletsDir(Boolean suggestChangeWalletsDir) {
+        this.suggestChangeWalletsDir = suggestChangeWalletsDir;
+        flush();
+    }
+
+    public File getWalletsDir() {
+        return walletsDir;
+    }
+
+    public void setWalletsDir(File walletsDir) {
+        this.walletsDir = walletsDir;
+        flush();
+    }
+
     public List<File> getRecentWalletFiles() {
         return recentWalletFiles;
     }

src/main/java/com/sparrowwallet/sparrow/io/Storage.java

@@ -485,7 +485,16 @@ public class Storage {
     }
 
     public static File getWalletsDir() {
-        File walletsDir = new File(getSparrowDir(), WALLETS_DIR);
+        File walletsDir = Config.get().getWalletsDir();
+        if(walletsDir != null) {
+            if(!walletsDir.exists() && (walletsDir.getParentFile() == null || !walletsDir.getParentFile().exists() || !walletsDir.getParentFile().canWrite())) {
+                log.info("Configured wallets directory " + walletsDir.getAbsolutePath() + " is not reachable, reverting to default");
+                walletsDir = null;
+            }
+        }
+        if(walletsDir == null) {
+            walletsDir = new File(getSparrowDir(), WALLETS_DIR);
+        }
         if(!walletsDir.exists()) {
             createOwnerOnlyDirectory(walletsDir);
         }