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b42303aa6f
So far, while parsing strings like "<ptn><more-letters>", the `getLast`
function immediately stopped on strings of the form "<ptn><whitespace>".
This may be a bit confusing given the functions name. Strings of
the—perhaps artificial—form
"a +d f 1 +d f 2"
would be cut short and parsed as
Deadline "a" (Time { date = Next Friday, tod = Just 01:00 })
instead of the more intuitive
Deadline "a +d f 1" (Time { date = Next Friday, tod = Just 02:00 }).
This is readily fixed by applying the `go` parser as often as possible,
only returning the longest list, and then pruning eventual leftovers at
the end of the string. Since we were already invoking `dropWhileEnd` to
trim whitespace before, the added `reverse`s should not impact
performance at all.
Fixes: https://github.com/xmonad/xmonad-contrib/issues/584