qt dark theme: use correct QR code icon (light/dark)

electrum/gui/qt/address_dialog.py

@@ -66,6 +66,7 @@ class AddressDialog(WindowModalDialog):
             for pubkey in pubkeys:
                 pubkey_e = ButtonsLineEdit(pubkey)
                 pubkey_e.addCopyButton(self.app)
+                pubkey_e.setReadOnly(True)
                 vbox.addWidget(pubkey_e)
 
         try:

electrum/gui/qt/qrtextedit.py

@@ -13,7 +13,8 @@ class ShowQRTextEdit(ButtonsTextEdit):
     def __init__(self, text=None):
         ButtonsTextEdit.__init__(self, text)
         self.setReadOnly(1)
-        self.addButton(":icons/qrcode.png", self.qr_show, _("Show as QR code"))
+        icon = ":icons/qrcode_white.png" if ColorScheme.dark_scheme else ":icons/qrcode.png"
+        self.addButton(icon, self.qr_show, _("Show as QR code"))
 
         run_hook('show_text_edit', self)
 

electrum/gui/qt/transaction_dialog.py

@@ -98,7 +98,8 @@ class TxDialog(QDialog, MessageBoxMixin):
         vbox.addWidget(QLabel(_("Transaction ID:")))
         self.tx_hash_e  = ButtonsLineEdit()
         qr_show = lambda: parent.show_qrcode(str(self.tx_hash_e.text()), 'Transaction ID', parent=self)
-        self.tx_hash_e.addButton(":icons/qrcode.png", qr_show, _("Show as QR code"))
+        qr_icon = ":icons/qrcode_white.png" if ColorScheme.dark_scheme else ":icons/qrcode.png"
+        self.tx_hash_e.addButton(qr_icon, qr_show, _("Show as QR code"))
         self.tx_hash_e.setReadOnly(True)
         vbox.addWidget(self.tx_hash_e)
         self.tx_desc = QLabel()
@@ -139,7 +140,7 @@ class TxDialog(QDialog, MessageBoxMixin):
         b.setDefault(True)
 
         self.qr_button = b = QPushButton()
-        b.setIcon(QIcon(":icons/qrcode.png"))
+        b.setIcon(QIcon(qr_icon))
         b.clicked.connect(self.show_qr)
 
         self.copy_button = CopyButton(lambda: str(self.tx), parent.app)