Resolve #1043 "Belegungsplan: Bearbeiten von Wiederholungsterminen versucht,...

Resolve #1043 "Belegungsplan: Bearbeiten von Wiederholungsterminen versucht, ausfallende Termine zu buchen"

Closes #1043

Merge request studip/studip!2602

lib/models/resources/ResourceBooking.class.php

@@ -511,7 +511,24 @@ class ResourceBooking extends SimpleORMap implements PrivacyObject, Studip\Calen
 
         $time_intervals = $this->calculateTimeIntervals(true);
         $time_interval_overlaps = [];
+        $existing_deleted_intervals = [];
+        if (!$this->isNew()) {
+            $existing_deleted_intervals = array_filter(
+                $this->getTimeIntervals(),
+                function ($i): bool {
+                    return !$i->takes_place;
+                }
+            );
+        }
         foreach ($time_intervals as $time_interval) {
+            foreach ($existing_deleted_intervals as $deleted_interval) {
+                if (
+                    $time_interval['begin']->getTimestamp() == $deleted_interval['begin']
+                    && $time_interval['end']->getTimestamp() == $deleted_interval['end']
+                ) {
+                    continue 2;
+                }
+            }
             $is_locked = $derived_resource->isLocked(
                 $time_interval['begin'],
                 $time_interval['end'],