Replace config GUI_LAST_WALLET with CURRENT_WALLET

- CURRENT_WALLET is set when a single wallet is loaded in memory, and it
   remains set after Electrum stops running.
 - If several wallets are loaded at the same time, CURRENT_WALLET is unset,
   and RPCs must specify the wallet explicitly (using --wallet for the CLI)
 - The fallback to 'default_wallet' essentially only applies when
   creating a new wallet file

electrum/gui/qml/qedaemon.py

@@ -178,7 +178,7 @@ class QEDaemon(AuthMixin, QObject):
         if path is None:
             self._path = self.daemon.config.get('wallet_path')  # command line -w option
             if self._path is None:
-                self._path = self.daemon.config.GUI_LAST_WALLET
+                self._path = self.daemon.config.CURRENT_WALLET
         else:
             self._path = path
         if self._path is None:

electrum/gui/qt/__init__.py

@@ -488,9 +488,6 @@ class ElectrumGui(BaseElectrumGui, Logger):
         if window in self.windows:
             self.windows.remove(window)
         self.build_tray_menu()
-        # save wallet path of last open window
-        if not self.windows:
-            self.config.save_last_wallet(window.wallet)
         run_hook('on_close_window', window)
         if window.should_stop_wallet_on_close:
             self.daemon.stop_wallet(window.wallet.storage.path)
@@ -555,7 +552,7 @@ class ElectrumGui(BaseElectrumGui, Logger):
             return
         # start wizard to select/create wallet
         self.timer.start()
-        path = self.config.get_wallet_path(use_gui_last_wallet=True)
+        path = self.config.get_wallet_path()
         try:
             if not self.start_new_window(path, self.config.get('url'), app_is_starting=True):
                 return

electrum/gui/stdio.py

@@ -26,7 +26,7 @@ class ElectrumGui(BaseElectrumGui, EventListener):
     def __init__(self, *, config, daemon, plugins):
         BaseElectrumGui.__init__(self, config=config, daemon=daemon, plugins=plugins)
         self.network = daemon.network
-        storage = WalletStorage(config.get_wallet_path(use_gui_last_wallet=True))
+        storage = WalletStorage(config.get_wallet_path())
         if not storage.file_exists():
             print("Wallet not found. try 'electrum create'")
             exit()

electrum/gui/text.py

@@ -62,7 +62,7 @@ class ElectrumGui(BaseElectrumGui, EventListener):
     def __init__(self, *, config: 'SimpleConfig', daemon: 'Daemon', plugins: 'Plugins'):
         BaseElectrumGui.__init__(self, config=config, daemon=daemon, plugins=plugins)
         self.network = daemon.network
-        storage = WalletStorage(config.get_wallet_path(use_gui_last_wallet=True))
+        storage = WalletStorage(config.get_wallet_path())
         password = None
         if not storage.file_exists():
             print("Wallet not found. try 'electrum create'")
@@ -70,7 +70,7 @@ class ElectrumGui(BaseElectrumGui, EventListener):
         if storage.is_encrypted():
             password = getpass.getpass('Password:', stream=None)
         del storage
-        self.wallet = self.daemon.load_wallet(config.get_wallet_path(use_gui_last_wallet=True), password)
+        self.wallet = self.daemon.load_wallet(config.get_wallet_path(), password)
         self.contacts = self.wallet.contacts
 
         locale.setlocale(locale.LC_ALL, '')