add file reader to QRTextEdit, to facilitate key imports

gui/qt/installwizard.py

@@ -128,6 +128,7 @@ class InstallWizard(QDialog):
         if func is None:
             func = self.is_any
         vbox, seed_e = seed_dialog.enter_seed_box(msg, self, sid)
+        seed_e.addButton(":icons/copy.png", seed_e.file_input, _("Read file"))
         vbox.addStretch(1)
         button = OkButton(self, _('Next'))
         vbox.addLayout(Buttons(CancelButton(self), button))

gui/qt/qrtextedit.py

@@ -38,6 +38,14 @@ class ScanQRTextEdit(ButtonsTextEdit):
         self.addButton(":icons/qrcode.png", self.qr_input, _("Read QR code"))
         run_hook('scan_text_edit', self)
 
+    def file_input(self):
+        fileName = unicode(QFileDialog.getOpenFileName(self, 'select file'))
+        if not fileName:
+            return
+        with open(fileName, "r") as f:
+            data = f.read()
+        self.setText(data)
+
     def qr_input(self):
         from electrum import qrscanner
         try: