indicate when entered seed is of unsupported electrum type

drongo

@@ -1 +1 @@
-Subproject commit e0302cef22a3dd9401f9070318fec5ea15543bd7
+Subproject commit 2fd7e8e7e417212c7b6555a463f25004650d3a01

src/main/java/com/sparrowwallet/sparrow/control/DateLabel.java

@@ -17,6 +17,10 @@ public class DateLabel extends CopyableLabel {
     }
 
     public static String getShortDateFormat(Date date) {
+        if(date == null) {
+            return "Unknown";
+        }
+
         Date now = new Date();
         long elapsed = (now.getTime() - date.getTime()) / 1000;
 

src/main/java/com/sparrowwallet/sparrow/control/MnemonicKeystoreImportPane.java

@@ -262,7 +262,13 @@ public class MnemonicKeystoreImportPane extends TitledDescriptionPane {
                         importer.getKeystore(wallet.getScriptType().getDefaultDerivation(), wordEntriesProperty.get(), passphraseProperty.get());
                         validChecksum = true;
                     } catch(ImportException e) {
-                        //ignore
+                        if(e.getCause() instanceof MnemonicException.MnemonicTypeException) {
+                            invalidLabel.setText("Unsupported Electrum seed");
+                            invalidLabel.setTooltip(new Tooltip("Seeds created in Electrum do not follow the BIP39 standard. Import the Electrum wallet file directly."));
+                        } else {
+                            invalidLabel.setText("Invalid checksum");
+                            invalidLabel.setTooltip(null);
+                        }
                     }
                 }
 

src/main/java/com/sparrowwallet/sparrow/io/Bip39.java

@@ -1,10 +1,7 @@
 package com.sparrowwallet.sparrow.io;
 
 import com.sparrowwallet.drongo.crypto.ChildNumber;
-import com.sparrowwallet.drongo.wallet.Bip39MnemonicCode;
-import com.sparrowwallet.drongo.wallet.DeterministicSeed;
-import com.sparrowwallet.drongo.wallet.Keystore;
-import com.sparrowwallet.drongo.wallet.WalletModel;
+import com.sparrowwallet.drongo.wallet.*;
 
 import java.util.List;
 
@@ -31,6 +28,15 @@ public class Bip39 implements KeystoreMnemonicImport {
             DeterministicSeed seed = new DeterministicSeed(mnemonicWords, passphrase, System.currentTimeMillis(), DeterministicSeed.Type.BIP39);
             return Keystore.fromSeed(seed, derivation);
         } catch (Exception e) {
+            try {
+                ElectrumMnemonicCode.INSTANCE.check(mnemonicWords);
+                throw new ImportException(new MnemonicException.MnemonicTypeException(DeterministicSeed.Type.ELECTRUM));
+            } catch(Exception ex) {
+                if(ex instanceof ImportException && ex.getCause() instanceof MnemonicException.MnemonicTypeException) {
+                    throw (ImportException)ex;
+                }
+            }
+
             throw new ImportException(e);
         }
     }