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Bug with 'inverse-background'

See original GitHub issue

Bug Reports

I have problem with Inverse Backgrounds in FullCalendar v4.1.0.

let calendarEl = document.getElementById(this.element_id);
this.calendar = new FullCalendar.Calendar(calendarEl, {
    plugins: [ 'timeGrid' ],
    height: "auto",
    nowIndicator : true,
    defaultView: 'timeGridWeek',
    defaultDate: "2019-04-17",
    events: [
       {
            id: 2,
            start: '2019-04-17 10:00:00',
            end: '2019-04-17 11:00:00',
            color: 'blue',
            rendering: 'inverse-background'
        } , {
            id: 2,
            start: '2019-04-17 14:00:00',
            end: '2019-04-17 15:00:00',
            color: 'blue',
            rendering: 'inverse-background'
        } , {
            id: 2,
            start: '2019-04-17 14:00:00',
            end: '2019-04-17 15:00:00',
            color: 'blue',
            rendering: 'inverse-background'
        } , {
            id: 2,
            start: '2019-04-17 14:00:00',
            end: '2019-04-17 15:00:00',
            color: 'blue',
            rendering: 'inverse-background'
        } , {
            id: 2,
            start: '2019-04-17 14:00:00',
            end: '2019-04-17 15:00:00',
            color: 'blue',
            rendering: 'inverse-background'
        }
    ]
});
this.calendar.render();

when i use this code events that share the same id wouldn’t grouped together when this rendering happens.

example: https://codepen.io/dev1ldragon/pen/jRRPYz