fixing some event repeating exceptions related to caldav sync handling

app/src/main/kotlin/com/simplemobiletools/calendar/pro/helpers/CalDAVHelper.kt

@@ -227,10 +227,15 @@ class CalDAVHelper(val context: Context) {
                     // if the event is an exception from another events repeat rule, find the original parent event
                     if (originalInstanceTime != 0L) {
                         val parentImportId = "$source-$originalId"
-                        val parentEventId = context.eventsDB.getEventIdWithImportId(parentImportId)
-                        if (parentEventId != null) {
-                            event.parentId = parentEventId
-                            eventsHelper.addEventRepetitionException(parentEventId, originalInstanceTime / 1000L, false)
+                        val parentEvent = context.eventsDB.getEventWithImportId(parentImportId)
+                        val originalDayCode = Formatter.getDayCodeFromTS(originalInstanceTime / 1000L)
+                        if (parentEvent != null && !parentEvent.repetitionExceptions.contains(originalDayCode)) {
+                            event.parentId = parentEvent.id!!
+                            parentEvent.addRepetitionException(originalDayCode)
+                            activity!!.eventsDB.insertOrUpdate(parentEvent)
+
+                            event.parentId = parentEvent.id!!
+                            eventsHelper.insertEvent(null, event, false)
                             continue
                         }
                     }

app/src/main/kotlin/com/simplemobiletools/calendar/pro/helpers/IcsImporter.kt

@@ -172,14 +172,9 @@ class IcsImporter(val activity: SimpleActivity) {
                                 } else {
                                     // if an event contains the RECURRENCE-ID field, it is an exception to a recurring event, so update its parent too
                                     val parentEvent = activity.eventsDB.getEventWithImportId(event.importId)
-                                    if (parentEvent != null) {
-                                        if (parentEvent.repetitionExceptions.contains(curRecurrenceDayCode)) {
-                                            continue
-                                        }
-
-                                        parentEvent.repetitionExceptions.add(curRecurrenceDayCode)
+                                    if (parentEvent != null && !parentEvent.repetitionExceptions.contains(curRecurrenceDayCode)) {
+                                        parentEvent.addRepetitionException(curRecurrenceDayCode)
                                         activity.eventsDB.insertOrUpdate(parentEvent)
-
                                         event.parentId = parentEvent.id!!
                                         eventsToInsert.add(event)
                                     }

app/src/main/kotlin/com/simplemobiletools/calendar/pro/models/Event.kt

@@ -154,6 +154,13 @@ data class Event(
         isPastEvent = endTSToCheck < getNowSeconds()
     }
 
+    fun addRepetitionException(daycode: String) {
+        var newRepetitionExceptions = repetitionExceptions
+        newRepetitionExceptions.add(daycode)
+        newRepetitionExceptions = newRepetitionExceptions.distinct().toMutableList() as ArrayList<String>
+        repetitionExceptions = newRepetitionExceptions
+    }
+
     var isPastEvent: Boolean
         get() = flags and FLAG_IS_PAST_EVENT != 0
         set(isPastEvent) {