qt export history/privkeys: put wallet name in path

closes https://github.com/spesmilo/electrum/issues/8255

electrum/gui/qt/history_list.py

@@ -826,7 +826,7 @@ class HistoryList(MyTreeView, AcceptFileDragDrop):
         d = WindowModalDialog(self, _('Export History'))
         d.setMinimumSize(400, 200)
         vbox = QVBoxLayout(d)
-        defaultname = f'electrum-history.csv'
+        defaultname = f'electrum-history-{self.wallet.basename()}.csv'
         select_msg = _('Select file to export your wallet transactions to')
         hbox, filename_e, csv_button = filename_field(self, self.config, defaultname, select_msg)
         vbox.addLayout(hbox)

electrum/gui/qt/main_window.py

@@ -2251,7 +2251,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger, QtEventListener):
         e.setReadOnly(True)
         vbox.addWidget(e)
 
-        defaultname = 'electrum-private-keys.csv'
+        defaultname = f'electrum-private-keys-{self.wallet.basename()}.csv'
         select_msg = _('Select file to export your private keys to')
         hbox, filename_e, csv_button = filename_field(self, self.config, defaultname, select_msg)
         vbox.addLayout(hbox)

electrum/wallet.py

@@ -548,7 +548,7 @@ class Abstract_Wallet(ABC, Logger, EventListener):
         return []
 
     def basename(self) -> str:
-        return self.storage.basename() if self.storage else 'no name'
+        return self.storage.basename() if self.storage else 'no_name'
 
     def test_addresses_sanity(self) -> None:
         addrs = self.get_receiving_addresses()