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range: Handle zero-length ranges when calculating overlap

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Zero length ranges, such as for events without a DTEND could be
considered to overlap a range if they were at exactly the end of the
range. The end of a range however is the first date that is supposed to
not overlap, so a zero-length range on exactly this point should not be
considered overlapping.

This fixes cases where all-day events from the next month could show up
on the same day of the current month if they did not have a DTEND.

This also adds tests for all possible cases of such zero-length events
overlapping.

Fixes https://gitlab.gnome.org/GNOME/gnome-calendar/-/issues/701
This commit is contained in:
Sebastian Keller
2021-04-21 13:59:26 +00:00
committed by Georges Basile Stavracas Neto
parent ce969c35b7
commit 44e2420645
2 changed files with 51 additions and 1 deletions
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tests/test-range.c
+32
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@@ -159,6 +159,38 @@ static struct {
GCAL_RANGE_NO_OVERLAP,
GCAL_RANGE_AFTER,
},
/* Zero length */
{
{ "2020-03-10T00:00:00", "2020-03-15T00:00:00" },
{ "2020-03-15T00:00:00", "2020-03-15T00:00:00" },
GCAL_RANGE_NO_OVERLAP,
GCAL_RANGE_BEFORE,
},
{
{ "2020-03-10T00:00:00", "2020-03-15T00:00:00" },
{ "2020-03-10T00:00:00", "2020-03-10T00:00:00" },
GCAL_RANGE_SUPERSET,
GCAL_RANGE_AFTER,
},
{
{ "2020-03-15T00:00:00", "2020-03-15T00:00:00" },
{ "2020-03-10T00:00:00", "2020-03-15T00:00:00" },
GCAL_RANGE_NO_OVERLAP,
GCAL_RANGE_AFTER,
},
{
{ "2020-03-10T00:00:00", "2020-03-10T00:00:00" },
{ "2020-03-10T00:00:00", "2020-03-15T00:00:00" },
GCAL_RANGE_SUBSET,
GCAL_RANGE_BEFORE,
},
{
{ "2020-03-10T00:00:00", "2020-03-10T00:00:00" },
{ "2020-03-10T00:00:00", "2020-03-10T00:00:00" },
GCAL_RANGE_EQUAL,
GCAL_RANGE_MATCH,
},
};
static void