fix windows crash on not paste

electrum/gui/qt/seed_dialog.py

@@ -639,34 +639,36 @@ def get_seed(self):
     def on_edit(self):
         s = ' '.join(self.get_seed_words())
         b = self.is_seed(s)
-        if self.seed_type == 'bip39':
-            from electrum.keystore import bip39_is_checksum_valid
-            from electrum.mnemonic import Wordlist, filenames
 
-            lang = ''
-            for type, file in filenames.items():
-                word_list = Wordlist.from_file(file)
-                is_checksum, is_wordlist = bip39_is_checksum_valid(s, wordlist=word_list)
-                if is_wordlist:
-                    lang = type
-                    break
+        from electrum.keystore import bip39_is_checksum_valid
+        from electrum.mnemonic import Wordlist, filenames
+
+        lang = ''
+        is_checksum = is_wordlist = False
+        for type, file in filenames.items():
+            word_list = Wordlist.from_file(file)
+            is_checksum, is_wordlist = bip39_is_checksum_valid(s, wordlist=word_list)
+            if not is_wordlist and len(s.split()) > 1:
+                is_checksum, is_wordlist = bip39_is_checksum_valid(' '.join(s.split()[:-1]), wordlist=word_list)
+            if is_wordlist:
+                lang = type
+                break
+
+        if lang and lang != self.lang:
+            if lang == 'en':
+                bip39_english_list = Mnemonic('en').wordlist
+                old_list = old_mnemonic.wordlist
+                only_old_list = set(old_list) - set(bip39_english_list)
+                self.wordlist = list(bip39_english_list) + list(only_old_list)  # concat both lists
+            else:
+                self.wordlist = list(Mnemonic(lang).wordlist)
+            self.wordlist.sort()
+            self.completer.model().setStringList(self.wordlist)
+            self.lang = lang
 
+        if self.seed_type == 'bip39':
             status = ('checksum: ' + ('ok' if is_checksum else 'failed')) if is_wordlist else 'unknown wordlist'
             label = 'BIP39 - ' + lang + ' (%s)'%status
-            if lang and lang != self.lang:
-                if lang == 'en':
-                    bip39_english_list = Mnemonic('en').wordlist
-                    old_list = old_mnemonic.wordlist
-                    only_old_list = set(old_list) - set(bip39_english_list)
-                    self.wordlist = list(bip39_english_list) + list(only_old_list)  # concat both lists
-                    self.wordlist.sort()
-                    self.completer.model().setStringList(self.wordlist)
-                    self.lang = 'en'
-                else:
-                    self.wordlist = list(Mnemonic(lang).wordlist)
-                    self.wordlist.sort()
-                    self.completer.model().setStringList(self.wordlist)
-                    self.lang = lang
 
         elif self.seed_type == 'slip39':
             self.slip39_mnemonics[self.slip39_mnemonic_index] = s