qt console history: ensure partial writes

electrum/gui/qt/console.py

@@ -187,6 +187,8 @@ class Console(QtWidgets.QPlainTextEdit):
             return
 
         if command and (not self.history or self.history[-1] != command):
+            while len(self.history) >= 50:
+                self.history.remove(self.history[0])
             self.history.append(command)
         self.history_index = len(self.history)
 

electrum/gui/qt/main_window.py

@@ -1550,7 +1550,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger, QtEventListener):
 
     def update_console(self):
         console = self.console
-        console.history = self.wallet.db.get("qt-console-history", [])
+        console.history = self.wallet.db.get_stored_item("qt-console-history", [])
         console.history_index = len(console.history)
 
         console.updateNamespace({
@@ -2620,7 +2620,6 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger, QtEventListener):
             g = self.geometry()
             self.wallet.db.put("winpos-qt", [g.left(),g.top(),
                                                   g.width(),g.height()])
-        self.wallet.db.put("qt-console-history", self.console.history[-50:])
         if self.qr_window:
             self.qr_window.close()
         self.close_wallet()