qml: close SwapDialog only after starting swap.

electrum/gui/qml/components/SwapDialog.qml

@@ -207,12 +207,12 @@ ElDialog {
             dialog.yesClicked.connect(function() {
                 dialog.close()
                 swaphelper.executeSwap(true)
-                root.close()
             })
             dialog.open()
         }
         onAuthRequired: {
             app.handleAuthRequired(swaphelper, method)
         }
+        onSwapStarted: root.close() // TODO: show swap progress monitor
     }
 }

electrum/gui/qml/qeswaphelper.py

@@ -20,6 +20,7 @@ class QESwapHelper(AuthMixin, QObject):
 
     error = pyqtSignal([str], arguments=['message'])
     confirm = pyqtSignal([str], arguments=['message'])
+    swapStarted = pyqtSignal()
 
     def __init__(self, parent=None):
         super().__init__(parent)
@@ -355,3 +356,4 @@ class QESwapHelper(AuthMixin, QObject):
             lightning_amount = self._receive_amount
             onchain_amount = self._send_amount
             self.do_normal_swap(lightning_amount, onchain_amount)
+        self.swapStarted.emit()