Calendar unusable with many full-day appointments

The calendar is not scrollable either.

added part::frontend type::bug labels

added prio::1 workflow::current-todo labels

assigned to @ZugBahnHof

assigned to @yuha and unassigned @ZugBahnHof

added core-4.0 label

created branch 1116-calendar-unusable-with-many-full-day-appointments to address this issue

mentioned in merge request !1689 (merged)

closed with merge request !1689 (merged)

mentioned in commit 5a7848e0

changed milestone to /AlekSIS%"[NLnet #6 (closed)] Do integration/final tests with pilot schools"