qt FileDialogs for transactions: better file extension filter

electrum/gui/qt/main_window.py

@@ -89,7 +89,7 @@ from .util import (read_QIcon, ColorScheme, text_dialog, icon_path, WaitingDialo
                    CloseButton, HelpButton, MessageBoxMixin, EnterButton,
                    ButtonsLineEdit, CopyCloseButton, import_meta_gui, export_meta_gui,
                    filename_field, address_field, char_width_in_lineedit, webopen,
-                   MONOSPACE_FONT)
+                   MONOSPACE_FONT, TRANSACTION_FILE_EXTENSION_FILTER)
 from .util import ButtonsTextEdit
 from .installwizard import WIF_HELP_TEXT
 from .history_list import HistoryList, HistoryModel
@@ -2751,7 +2751,8 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
         self.show_transaction(tx)
 
     def read_tx_from_file(self) -> Optional[Transaction]:
-        fileName = self.getOpenFileName(_("Select your transaction file"), "*.txn;;*.psbt")
+        fileName = self.getOpenFileName(_("Select your transaction file"),
+                                        TRANSACTION_FILE_EXTENSION_FILTER)
         if not fileName:
             return
         try:

electrum/gui/qt/transaction_dialog.py

@@ -47,7 +47,7 @@ from electrum.logging import get_logger
 
 from .util import (MessageBoxMixin, read_QIcon, Buttons, CopyButton, icon_path,
                    MONOSPACE_FONT, ColorScheme, ButtonsLineEdit, text_dialog,
-                   char_width_in_lineedit)
+                   char_width_in_lineedit, TRANSACTION_FILE_EXTENSION_FILTER)
 
 if TYPE_CHECKING:
     from .main_window import ElectrumWindow
@@ -287,7 +287,9 @@ class TxDialog(QDialog, MessageBoxMixin):
             name = 'signed_%s.txn' % (tx.txid()[0:8])
         else:
             name = self.wallet.basename() + time.strftime('-%Y%m%d-%H%M.psbt')
-        fileName = self.main_window.getSaveFileName(_("Select where to save your signed transaction"), name, "*.txn;;*.psbt")
+        fileName = self.main_window.getSaveFileName(_("Select where to save your signed transaction"),
+                                                    name,
+                                                    TRANSACTION_FILE_EXTENSION_FILTER)
         if not fileName:
             return
         if tx.is_complete():  # network tx hex

electrum/gui/qt/util.py

@@ -50,6 +50,8 @@ pr_icons = {
 }
 
 
+# filter tx files in QFileDialog:
+TRANSACTION_FILE_EXTENSION_FILTER = "Transaction (*.txn *.psbt);;All files (*)"
 
 
 class EnterButton(QPushButton):