From 849c8e719a27dc2e67a75aca8c61b1df94b676d3 Mon Sep 17 00:00:00 2001
From: ser8phin <eva.wolkwitz@gmx.de>
Date: Fri, 14 Jan 2022 14:46:04 +0100
Subject: [PATCH] Fix #555 -- Preselect a single required add-on (#2395)

---
 .../pretixpresale/event/fragment_addon_choice.html         | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/pretix/presale/templates/pretixpresale/event/fragment_addon_choice.html b/src/pretix/presale/templates/pretixpresale/event/fragment_addon_choice.html
index 7af88c0abb..d3bc3f917f 100644
--- a/src/pretix/presale/templates/pretixpresale/event/fragment_addon_choice.html
+++ b/src/pretix/presale/templates/pretixpresale/event/fragment_addon_choice.html
@@ -285,7 +285,12 @@
                             {% if c.max_count == 1 or not c.multi_allowed %}
                                 <label class="item-checkbox-label">
                                     <input type="checkbox" value="1"
-                                            {% if item.initial %}checked="checked"{% endif %}
+                                            {% if c.max_count == 1 and c.min_count == 1 and c.items|length == 1 %}
+                                                checked="checked"
+                                                disabled="disabled"
+                                            {% elif item.initial %}
+                                                checked="checked"
+                                            {% endif %}
                                             name="cp_{{ form.pos.pk }}_item_{{ item.id }}"
                                             id="cp_{{ form.pos.pk }}_item_{{ item.id }}"
                                             aria-label="{% blocktrans with item=item.name %}Add {{ item }} to cart{% endblocktrans %}"