qt: send tab: show "pay to many" label

This changes the "Pay to" label to "Pay to many" if the user enables the
"Pay to many" option and aligns it at the top of the payto_e instead of
moving ot to the center when the payto_e expands.

Author: f321x

electrum/gui/qt/send_tab.py

@@ -84,8 +84,8 @@ def __init__(self, window: 'ElectrumWindow'):
                + _("To set the amount to 'max', use the '!' special character.") + "\n"
                + _("Integers weights can also be used in conjunction with '!', "
                    "e.g. set one amount to '2!' and another to '3!' to split your coins 40-60."))
-        payto_label = HelpLabel(_('Pay to'), msg)
-        grid.addWidget(payto_label, 0, 0)
+        self.payto_label = HelpLabel(_('Pay to'), msg)
+        grid.addWidget(self.payto_label, 0, 0, Qt.AlignmentFlag.AlignLeft)
         grid.addWidget(self.payto_e, 0, 1, 1, 4)
 
         #completer = QCompleter()
@@ -822,6 +822,11 @@ def toggle_paytomany(self):
                 _('You may load a CSV file using the file icon.')
             ])
             self.window.show_tooltip_after_delay(message)
+            self.payto_label.setAlignment(Qt.AlignmentFlag.AlignTop)
+            self.payto_label.setText(_('Pay to many'))
+        else:
+            self.payto_label.setAlignment(Qt.AlignmentFlag.AlignLeft)
+            self.payto_label.setText(_('Pay to'))
 
     def payto_contacts(self, labels):
         paytos = [self.window.get_contact_payto(label) for label in labels]