From a3e7f7fd14bf90daa0e1095de7a1940ea1bc9c8c Mon Sep 17 00:00:00 2001
From: Alexander Van der Bellen <alexandervanderbellen@catalyst-au.net>
Date: Wed, 25 Oct 2023 14:31:20 +0800
Subject: [PATCH] MDL-78650 mod_assign: Improve group submission action event
 handling

Don't return an event action when a group submission has already been submitted
by another student.
---
 mod/assign/lib.php | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/mod/assign/lib.php b/mod/assign/lib.php
index 0a85b0847d8..8d23b704de2 100644
--- a/mod/assign/lib.php
+++ b/mod/assign/lib.php
@@ -1584,6 +1584,14 @@ function mod_assign_core_calendar_provide_event_action(calendar_event $event,
             return null;
         }
 
+        $instance = $assign->get_instance();
+        if ($instance->teamsubmission && !$instance->requireallteammemberssubmit) {
+            $groupsubmission = $assign->get_group_submission($userid, 0, false);
+            if ($groupsubmission && $groupsubmission->status === ASSIGN_SUBMISSION_STATUS_SUBMITTED) {
+                return null;
+            }
+        }
+
         $participant = $assign->get_participant($userid);
 
         if (!$participant) {