Disconnect finished signals

src/sakia/gui/certification.py

@@ -242,7 +242,7 @@ class CertificationDialog(QObject):
 
     def async_exec(self):
         future = asyncio.Future()
-        self.widget.finished.connect(lambda r: future.set_result(r))
+        self.widget.finished.connect(lambda r: future.set_result(r) and self.widget.finished.disconnect())
         self.widget.open()
         self.refresh()
         return future

src/sakia/gui/transfer.py

@@ -218,7 +218,7 @@ class TransferMoneyDialog(QObject):
 
     def async_exec(self):
         future = asyncio.Future()
-        self.widget.finished.connect(lambda r: future.set_result(r))
+        self.widget.finished.connect(lambda r: future.set_result(r) and self.widget.finished.disconnect())
         self.widget.open()
         return future