spidev copies received data into tx buffer which corrupts led_values

[windy54]

def write_leds(self):
    """write_leds() writes all stored led_values to LEDs"""
    self.flush_leds()
    for value in self.led_values:
        self.send = spi.xfer(value)
    for x in range((self.numleds // 32) +2):  #check this not overkill
        self.flush_leds()

the latest version of spider copies the received data into the tx variable so the line
self.send = spi.xfer(value)
results in received data being copied into self.send and value. this means that self.led_values also gets modified by the received data, resulting in led_values been set to [0,0,0,0]. So in example03.py the data gets corrupted and only the first led addresses.

I have "fixed" it by adding
import copy at the top of the file
and changing the for loop to

    for value in self.led_values:
        txdata=copy.copy(value)
        self.send = spi.xfer(txdata)

example03 now works. I am not sure if there is a more elegant fix which is why I have not posted me version of apa.py