qml: handle phase-2 lnurl errors from within WalletMainView, add sanity check on

the bolt11 invoice we get from the service

electrum/gui/qml/components/LnurlPayRequestDialog.qml

@@ -102,12 +102,4 @@ ElDialog {
         }
     }
 
-    Connections {
-        target: invoiceParser
-        function onLnurlError(code, message) {
-            var dialog = app.messageDialog.createObject(app, { text: message })
-            dialog.open()
-        }
-    }
-
 }

electrum/gui/qml/components/WalletMainView.qml

@@ -235,9 +235,14 @@ Item {
         onInvoiceCreateError: console.log(code + ' ' + message)
 
         onLnurlRetrieved: {
+            closeSendDialog()
             var dialog = lnurlPayDialog.createObject(app, { invoiceParser: invoiceParser })
             dialog.open()
         }
+        onLnurlError: {
+            var dialog = app.messageDialog.createObject(app, { text: message })
+            dialog.open()
+        }
     }
 
     Connections {

electrum/gui/qml/qeinvoice.py

@@ -620,16 +620,21 @@ class QEInvoiceParser(QEInvoice, QtEventListener):
                     params['comment'] = comment
                 coro = callback_lnurl(self._lnurlData['callback_url'], params)
                 fut = asyncio.run_coroutine_threadsafe(coro, self._wallet.wallet.network.asyncio_loop)
-                self.on_lnurl_invoice(fut.result())
+                self.on_lnurl_invoice(amount, fut.result())
             except Exception as e:
-                self.lnurlError.emit('lnurl', repr(e))
+                self._logger.error(repr(e))
+                self.lnurlError.emit('lnurl', str(e))
 
         threading.Thread(target=fetch_invoice_task).start()
 
-    def on_lnurl_invoice(self, invoice):
+    def on_lnurl_invoice(self, orig_amount, invoice):
         self._logger.debug('on_lnurl_invoice')
         self._logger.debug(f'{repr(invoice)}')
 
+        # assure no shenanigans with the bolt11 invoice we get back
+        lninvoice = Invoice.from_bech32(invoice)
+        assert orig_amount * 1000 == lninvoice.amount_msat
+
         invoice = invoice['pr']
         self.recipient = invoice