FullCalendar stacked events are not in full width (timeGridDay)

1

I’m using FullCalendar v6 with a timeGridDay view and slotDuration: ‘00:15:00’. Events are editable and can overlap (slotEventOverlap: true).

I noticed a strange layout issue when I have back-to-back events on the same day — for example:

Event A → 11:45–12:00 Event B → 12:00–12:45 Event C → 12:45–13:00

Even though these events do not actually overlap, FullCalendar renders them as if they do — each one appears half-width, as if it’s sharing the same time slot with another event.

I still need to allow real overlapping events (so slotEventOverlap: true must stay), but I want events that only touch at their boundaries (end == start of next) to be full width.

My calendar options are

  this.calendarOptions = {
            slotEventOverlap: true,
            initialView: 'timeGridDay',
            plugins: [timeGridPlugin, interactionPlugin, resourceTimeGridPlugin, resourceTimeline],
            allDaySlot: false,
            slotDuration: '00:15:00',
            slotLabelInterval: '00:30:00',
            slotLabelFormat: {
                hour: 'numeric',
                minute: '2-digit',
                omitZeroMinute: false,
                meridiem: 'short',
                hour12: false,
            },
            slotMinTime: '07:00:00',
            slotMaxTime: '23:00:00',
            stickyHeaderDates: false,
            headerToolbar: false,
            contentHeight: window.innerHeight - 180,
            height: window.innerHeight - 180,
            expandRows: true,
            eventBackgroundColor: '#FFFFFF',
            eventBorderColor: '#FFFFFF',
            editable: true,
            firstDay: 1,
            nowIndicator: true,
            selectable: true,
}

How can I make all events that are not truly overlapping (within the same day) render at full width,
while keeping real overlapping events stacked side-by-side?

I want to keep slotEventOverlap: true, but visually show:

:white_check_mark: Back-to-back events → full width
:white_check_mark: Real overlaps → shared space