From be2e38ed92b2416200ad8e6e730fdb3421ff6d5b Mon Sep 17 00:00:00 2001
From: Marina Glancy <marina@moodle.com>
Date: Tue, 21 Nov 2017 14:54:45 +0800
Subject: [PATCH] MDL-56864 forms: boost templates don't allow remove last tag

---
 lib/form/tags.php                                            | 1 +
 theme/boost/templates/core_form/element-tags-inline.mustache | 1 +
 theme/boost/templates/core_form/element-tags.mustache        | 1 +
 3 files changed, 3 insertions(+)

diff --git a/lib/form/tags.php b/lib/form/tags.php
index b62eaf97f66..390c723ed58 100644
--- a/lib/form/tags.php
+++ b/lib/form/tags.php
@@ -257,6 +257,7 @@ class MoodleQuickForm_tags extends MoodleQuickForm_autocomplete {
             $url = new moodle_url('/tag/manage.php', array('tc' => $this->get_tag_collection()));
             $context['managestandardtagsurl'] = $url->out(false);
         }
+        $context['nameraw'] = $this->getName();
 
         return $context;
     }
diff --git a/theme/boost/templates/core_form/element-tags-inline.mustache b/theme/boost/templates/core_form/element-tags-inline.mustache
index d4a79dca7a1..5552bac5f36 100644
--- a/theme/boost/templates/core_form/element-tags-inline.mustache
+++ b/theme/boost/templates/core_form/element-tags-inline.mustache
@@ -1,6 +1,7 @@
 {{< core_form/element-template-inline }}
     {{$element}}
         {{^element.frozen}}
+        <input type="hidden" name="{{element.nameraw}}" value="_qf__force_multiselect_submission">
         <select class="custom-select {{#error}}form-control-danger{{/error}}" name="{{element.name}}"
             id="{{element.id}}"
             {{#element.multiple}}multiple{{/element.multiple}}
diff --git a/theme/boost/templates/core_form/element-tags.mustache b/theme/boost/templates/core_form/element-tags.mustache
index c0e910e40bb..5f956759868 100644
--- a/theme/boost/templates/core_form/element-tags.mustache
+++ b/theme/boost/templates/core_form/element-tags.mustache
@@ -1,6 +1,7 @@
 {{< core_form/element-template }}
     {{$element}}
         {{^element.frozen}}
+        <input type="hidden" name="{{element.nameraw}}" value="_qf__force_multiselect_submission">
         <select class="custom-select {{#error}}form-control-danger{{/error}}" name="{{element.name}}"
             id="{{element.id}}"
             {{#element.multiple}}multiple{{/element.multiple}}
-- 
2.11.4.GIT