def onShortcutUnindentWithBackspace(self):
        """Backspace pressed, unindent
        """
        assert self._qpart.textBeforeCursor().endswith(self.text())

        charsToRemove = len(self._qpart.textBeforeCursor()) % len(self.text())
        if charsToRemove == 0:
            charsToRemove = len(self.text())

        cursor = self._qpart.textCursor()
        cursor.setPosition(cursor.position() - charsToRemove, QTextCursor.KeepAnchor)
        cursor.removeSelectedText()
def current_label(self) -> ProtocolLabel:
        if len(self.message.message_type) == 0:
            return None

        cur_label = self.message.message_type[self.current_label_index].get_copy()
        self.message.message_type[self.current_label_index] = cur_label
        cur_label.fuzz_values = [fv for fv in cur_label.fuzz_values if fv]  # Remove empty strings

        if len(cur_label.fuzz_values) == 0:
            cur_label.fuzz_values.append(self.message.plain_bits_str[cur_label.start:cur_label.end])
        return cur_label