kivy: offer to copy raw hex tx to clipboard

related: #5405

electrum/gui/kivy/main_window.py

@@ -435,7 +435,8 @@ class ElectrumWindow(App):
                 msg += '\n' + _('Text copied to clipboard.')
                 self._clipboard.copy(text_for_clipboard)
             Clock.schedule_once(lambda dt: self.show_info(msg))
-        popup = QRDialog(title, data, show_text, on_qr_failure)
+        popup = QRDialog(title, data, show_text, failure_cb=on_qr_failure,
+                         text_for_clipboard=text_for_clipboard)
         popup.open()
 
     def scan_qr(self, on_complete):

electrum/gui/kivy/uix/dialogs/qr_dialog.py

@@ -1,5 +1,11 @@
 from kivy.factory import Factory
 from kivy.lang import Builder
+from kivy.core.clipboard import Clipboard
+from kivy.app import App
+from kivy.clock import Clock
+
+from electrum.gui.kivy.i18n import _
+
 
 Builder.load_string('''
 <QRDialog@Popup>
@@ -24,9 +30,12 @@ Builder.load_string('''
             BoxLayout:
                 size_hint: 1, None
                 height: '48dp'
-                Widget:
+                Button:
                     size_hint: 1, None
                     height: '48dp'
+                    text: _('Copy to clipboard')
+                    on_release:
+                        root.copy_to_clipboard()
                 Button:
                     size_hint: 1, None
                     height: '48dp'
@@ -36,12 +45,20 @@ Builder.load_string('''
 ''')
 
 class QRDialog(Factory.Popup):
-    def __init__(self, title, data, show_text, failure_cb=None):
+    def __init__(self, title, data, show_text, *,
+                 failure_cb=None, text_for_clipboard=None):
         Factory.Popup.__init__(self)
+        self.app = App.get_running_app()
         self.title = title
         self.data = data
         self.show_text = show_text
         self.failure_cb = failure_cb
+        self.text_for_clipboard = text_for_clipboard if text_for_clipboard else data
 
     def on_open(self):
         self.ids.qr.set_data(self.data, self.failure_cb)
+
+    def copy_to_clipboard(self):
+        Clipboard.copy(self.text_for_clipboard)
+        msg = _('Text copied to clipboard.')
+        Clock.schedule_once(lambda dt: self.app.show_info(msg))