qt receive tab: fix creating new payreq with all used imported wallet

fixes #6325

electrum/gui/qt/main_window.py

@@ -1209,7 +1209,10 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
             key = self.wallet.lnworker.add_request(amount, message, expiry)
         else:
             key = self.create_bitcoin_request(amount, message, expiry)
+            if not key:
+                return
             self.address_list.update()
+        assert key is not None
         self.request_list.update()
         self.request_list.select_key(key)
         # clear request fields
@@ -1221,20 +1224,23 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
         title = _('Invoice') if is_lightning else _('Address')
         self.do_copy(content, title=title)
 
-    def create_bitcoin_request(self, amount, message, expiration):
+    def create_bitcoin_request(self, amount, message, expiration) -> Optional[str]:
         addr = self.wallet.get_unused_address()
         if addr is None:
-            if not self.wallet.is_deterministic():
+            if not self.wallet.is_deterministic():  # imported wallet
                 msg = [
-                    _('No more addresses in your wallet.'),
+                    _('No more addresses in your wallet.'), ' ',
-                    _('You are using a non-deterministic wallet, which cannot create new addresses.'),
+                    _('You are using a non-deterministic wallet, which cannot create new addresses.'), ' ',
-                    _('If you want to create new addresses, use a deterministic wallet instead.')
+                    _('If you want to create new addresses, use a deterministic wallet instead.'), '\n\n',
+                    _('Creating a new payment request will reuse one of your addresses and overwrite an existing request. Continue anyway?'),
                    ]
-                self.show_message(' '.join(msg))
+                if not self.question(''.join(msg)):
-                return
+                    return
-            if not self.question(_("Warning: The next address will not be recovered automatically if you restore your wallet from seed; you may need to add it manually.\n\nThis occurs because you have too many unused addresses in your wallet. To avoid this situation, use the existing addresses first.\n\nCreate anyway?")):
+                addr = self.wallet.get_receiving_address()
-                return
+            else:  # deterministic wallet
-            addr = self.wallet.create_new_address(False)
+                if not self.question(_("Warning: The next address will not be recovered automatically if you restore your wallet from seed; you may need to add it manually.\n\nThis occurs because you have too many unused addresses in your wallet. To avoid this situation, use the existing addresses first.\n\nCreate anyway?")):
+                    return
+                addr = self.wallet.create_new_address(False)
         req = self.wallet.make_payment_request(addr, amount, message, expiration)
         try:
             self.wallet.add_payment_request(req)

electrum/lnworker.py

@@ -1123,7 +1123,7 @@ class LNWallet(LNWorker):
         route[-1].node_features |= invoice_features
         return route
 
-    def add_request(self, amount_sat, message, expiry):
+    def add_request(self, amount_sat, message, expiry) -> str:
         coro = self._add_request_coro(amount_sat, message, expiry)
         fut = asyncio.run_coroutine_threadsafe(coro, self.network.asyncio_loop)
         try:
@@ -1158,7 +1158,7 @@ class LNWallet(LNWorker):
         self.save_payment_info(info)
         return lnaddr, invoice
 
-    async def _add_request_coro(self, amount_sat: Optional[int], message, expiry: int):
+    async def _add_request_coro(self, amount_sat: Optional[int], message, expiry: int) -> str:
         lnaddr, invoice = await self.create_invoice(amount_sat, message, expiry)
         key = bh2u(lnaddr.paymenthash)
         req = LNInvoice.from_bech32(invoice)