khal does no longer build

For the record, the problem was that the test_set_focus_date_weekstart_6 test was failing. For testing, khal overrides the current date using the freezegun package. This takes effect after the call to freeze_time; however python evaluates default arguments only once--in this case before the call to freeze_time. The culprit is the following code in calendarwidget.py:

    def _construct_month(self,
                         year=date.today().year,
                         month=date.today().month,
                         clean_first_row=False,
                         clean_last_row=False):

Here, year and date default to the current date (2016-06-18), however the rest of the code expects the overriden date (2016-04-10).

This is fixed in master, probably in this commit. I didn't want to backport the fix, as there seemed to be several commits related to this issue and it's unclear what dependencies they have.

We might also need to upgrade khal to the git version soon, as khal 0.8.2 no longer works with the current version of icalendar (3.10), this is fixed in master as well.

NixOS / nixpkgs

khal does no longer build #15981

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