fix bug with more+ link, async event sources. closes #4585

src/daygrid/DayGrid.ts

@@ -609,7 +609,7 @@ export default class DayGrid extends DateComponent<DayGridProps> {
           moreLink = this.renderMoreLink(row, col, segsBelow)
           moreWrap = createElement('div', null, moreLink)
           td.appendChild(moreWrap)
-          moreNodes.push(moreWrap[0])
+          moreNodes.push(moreWrap)
         }
         col++
       }

tests/automated/event-source/async-eventLimit.js

@@ -0,0 +1,47 @@
+
+// https://github.com/fullcalendar/fullcalendar/issues/4585
+// more related to the 'more+' link than to async event sources
+it('rerendering works with async sources and eventLimit', function(done) {
+  let cnt = 0
+
+  initCalendar({
+    defaultView: 'dayGridMonth',
+    eventLimit: 2,
+    header: {
+      left: 'prev,next today',
+      center: 'title',
+      right: 'timeGridWeek,dayGridMonth'
+    },
+    eventSources: [
+      getEvents,
+      getEvents
+    ],
+    _eventsPositioned() { // why can't use spyOnCalendarCallback :(
+      cnt++
+      if (cnt === 1) {
+        currentCalendar.next()
+        setTimeout(done, 1) // after the async fetch
+      }
+    }
+  })
+})
+
+function getEvents(fetchInfo, success) {
+  let date = fetchInfo.start
+  let events = []
+
+  while (date.getTime() < fetchInfo.end.getTime()) {
+    events.push({
+      title: 'Event ' + date.getDate(),
+      start: date,
+      end: new Date(date.getTime() + 1000 * 60 * 60 * 60),
+      allDay: false
+    })
+
+    date = new Date(date.getTime() + 1000 * 60 * 60 * 24)
+  }
+
+  setTimeout(function() {
+    success(events)
+  }, 0)
+}