Calendar: Fix events from group invitations did not always show up when viewing calendar of a group member

Fixed by pre-fetching the group members before trying to display events so they're there when we check

calendar/js/app.ts

@@ -57,6 +57,8 @@ import {tapAndSwipe} from "../../api/js/tapandswipe";
 import {CalendarOwner} from "./CalendarOwner";
 import {et2_IInput} from "../../api/js/etemplate/et2_core_interfaces";
 import {Et2DateTime} from "../../api/js/etemplate/Et2Date/Et2DateTime";
+import {Et2Select} from "../../api/js/etemplate/Et2Select/Et2Select";
+import type {SelectOption} from "../../api/js/etemplate/Et2Select/FindSelectOptions";
 
 /**
  * UI for calendar
@@ -3743,6 +3745,60 @@ export class CalendarApp extends EgwApp
 		);
 	}
 
+	/**
+	 * Pre-fetch the members of any group participants
+	 *
+	 * This is done to avoid rewriting since group fetching is async.  We fetch missing group members in advance,
+	 * then hold the data in the sidebox select options for immediate access when checking if an event should be displayed
+	 * in a particular calendar.
+	 *
+	 * @param event
+	 * @return Promise
+	 */
+	async _fetch_group_members(event) : Promise<any>
+	{
+		let groups = [];
+		let option_owner = null;
+		let options : SelectOption[];
+		if(app.calendar && app.calendar.sidebox_et2 && app.calendar.sidebox_et2.getWidgetById('owner'))
+		{
+			option_owner = app.calendar.sidebox_et2.getWidgetById('owner');
+		}
+		else
+		{
+			option_owner = parent.getArrayMgr("sel_options").getRoot().getEntry('owner');
+		}
+
+		options = option_owner.select_options;
+
+		for(const id of Object.keys(event.participants))
+		{
+			if(parseInt(id) >= 0)
+			{
+				continue;
+			}
+			let resource = options.find((o) => o.value === id);
+			if(!resource || resource && !resource.resources)
+			{
+				groups.push(parseInt(id));
+			}
+		}
+
+		// Find missing groups
+		if(groups.length)
+		{
+			return this.egw.request("calendar.calendar_owner_etemplate_widget.ajax_owner", [groups]).then((data) =>
+			{
+				options = options.concat(Object.values(data));
+				option_owner.select_options = options;
+			});
+		}
+		else
+		{
+			return Promise.resolve();
+		}
+	}
+
 	/**
 	 * We have a list of calendar UIDs of events that need updating.
 	 * Public wrapper for _update_events so we can call it from server

calendar/js/et2_widget_daycol.ts

@@ -370,11 +370,18 @@ export class et2_calendar_daycol extends et2_valueWidget implements et2_IDetache
 	_data_callback( event_ids)
 	{
 		const events = [];
-		if(event_ids == null || typeof event_ids.length == 'undefined') event_ids = [];
+		const waitForGroups = [];
+		if(event_ids == null || typeof event_ids.length == 'undefined')
+		{
+			event_ids = [];
+		}
+
 		for(let i = 0; i < event_ids.length; i++)
 		{
-			let event : any = egw.dataGetUIDdata('calendar::'+event_ids[i]);
+			let event : any = egw.dataGetUIDdata('calendar::' + event_ids[i]);
 			event = event && event.data || false;
+			waitForGroups.push((<CalendarApp>app.calendar)._fetch_group_members(event).then(() =>
+			{
 				if(event && event.date && et2_calendar_event.owner_check(event, this) && (
 					event.date === this.options.date ||
 					// Accept multi-day events
@@ -383,27 +390,34 @@ export class et2_calendar_daycol extends et2_valueWidget implements et2_IDetache
 				{
 					events.push(event);
 				}
-			else if (event)
+				else if(event)
 				{
 					// Got an ID that doesn't belong
-				event_ids.splice(i--,1);
+					event_ids.splice(i--, 1);
 				}
+			}));
 		}
 
+		Promise.all(waitForGroups).then(() =>
+		{
 			if(!this.div.is(":visible"))
 			{
 				// Not visible, defer the layout or it all winds up at the top
 				// Cancel any existing listener & bind
 				jQuery(this.getInstanceManager().DOMContainer.parentNode)
-				.off('show.'+CalendarApp._daywise_cache_id(this.options.date, this.options.owner))
-				.one('show.'+CalendarApp._daywise_cache_id(this.options.date, this.options.owner), function() {
+					.off('show.' + CalendarApp._daywise_cache_id(this.options.date, this.options.owner))
+					.one('show.' + CalendarApp._daywise_cache_id(this.options.date, this.options.owner), function()
+					{
 						this._update_events(events)
 					}.bind(this));
 				return;
 			}
 			if(!this.getParent().disabled)
+			{
 				this._update_events(events);
 			}
+		});
+	}
 
 	set_label( label)
 	{