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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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src/core/gcal-range.c
+19 -1
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@@ -320,7 +320,25 @@ gcal_range_calculate_overlap (GcalRange *a,
}
else if (a_end_b_end_diff == 0)
{
if (a_start_b_start_diff < 0)
gint a_start_b_end_diff;
gint a_end_b_start_diff;
a_start_b_end_diff = compare_func (a->range_start, b->range_end);
a_end_b_start_diff = compare_func (a->range_end, b->range_start);
if (a_start_b_end_diff >= 0)
{
/* Case 5.i for zero length A */
overlap = GCAL_RANGE_NO_OVERLAP;
position = GCAL_RANGE_AFTER;
}
else if (a_end_b_start_diff <= 0)
{
/* Case 5.ii for zero length B */
overlap = GCAL_RANGE_NO_OVERLAP;
position = GCAL_RANGE_BEFORE;
}
else if (a_start_b_start_diff < 0)
{
/* Case 2.iii */
overlap = GCAL_RANGE_SUPERSET;