Refetch day on delete of item without oldId

aleksis/apps/chronos/frontend/components/substitutions/SubstitutionCard.vue

@@ -256,7 +256,7 @@ export default {
             cached[index].id = cached[index].oldId;
             cached[index].oldId = null;
           } else {
-            this.$emit("delete");
+            this.$emit("delete", cached[index].datetimeStart);
           }
         }
         return cached;
@@ -317,7 +317,6 @@ export default {
         this.comment = null;
         this.cancelled = null;
       } else if (!this.substitution.id.startsWith("DUMMY")) {
-        // FIXME: this makes deleted substitutions disappear temporarily – which is easy to resolve in case they still have an oldId but probably requires a refetch of the respective day when existing substitutions that were fetched are deleted to regain the dummy ID.
         this.delete([this.substitution]);
       }
     },

aleksis/apps/chronos/frontend/components/substitutions/SubstitutionOverview.vue

@@ -11,6 +11,8 @@ import {
   gqlGroups,
   gqlTeachers,
 } from "../amendLesson.graphql";
+
+import { DateTime } from "luxon";
 </script>
 
 <template>
@@ -95,6 +97,7 @@ import {
         :is-create="false"
         :gql-patch-mutation="gqlPatchMutation"
         :gql-delete-mutation="gqlDeleteMutation"
+        @delete="handleDelete"
       />
     </template>
 
@@ -155,6 +158,9 @@ export default {
       });
       this.$refs.iterator.resetDate();
     },
+    handleDelete(datetime) {
+      this.$refs.iterator.refetchDay(DateTime.fromISO(datetime).toISODate());
+    },
   },
   computed: {
     gqlQueryArgs() {