Drop highest/lowest (X/x) operator returns sum of dropped dice as result rather than sum of kept dice

[jeremy-w]

The section involved is:

py-rolldice/rolldice/rolldice.py

Lines 815 to 817 in 876607b

	results.append(sum(group_result[:num_to_drop]))
	roll = ','.join([str(i) for i in group_result[num_to_drop:]]) + ' ~~ ' # Same as above.
	roll += ','.join([str(i) for i in group_result[:num_to_drop]])

You can see it summing the rolls from index 0 up to num_to_drop and adding that to results. But those are the dropped dice, not the kept ones.

Example output for rolling 6d6 and dropping the lowest 2:

>>> rolldice.roll_dice('6d6x2')
(3, '[2,2,2,4 ~~ 1,2]')

It dropped 1 and 2, and the result shown is 3, even though it kept 4 dice summing to 10.

Expected output thus would have been:

>>> rolldice.roll_dice('6d6x2')
(10, '[2,2,2,4 ~~ 1,2]')