Update compatibility with `django-streamfield`.

admin_interface/static/admin_interface/css/third-party/streamfield.css

@@ -49,7 +49,7 @@ https://github.com/raagin/django-streamfield/
     padding: 0;
 }
 
-.admin-interface .streamfield_app .collapse-handler {
+.admin-interface .streamfield_app .collapse-handlers .collapse-handler {
     user-select: none;
     padding: 8px;
     padding-right: 0;
@@ -58,9 +58,9 @@ https://github.com/raagin/django-streamfield/
     text-decoration: none;
 }
 
-.admin-interface .streamfield_app .collapse-handler:hover {
+.admin-interface .streamfield_app .collapse-handlers .collapse-handler:hover {
     color: var(--admin-interface-generic-link-hover-color);
-    text-decoration: none;
+    text-decoration: underline;
 }
 
 .admin-interface .streamfield_app .stream-model-block {
@@ -85,6 +85,12 @@ https://github.com/raagin/django-streamfield/
     padding: 10px 10px 10px 20px;
 }
 
+.admin-interface .streamfield_app .stream-model-block .streamblock__block__title .streamblock__block__model_title {
+    white-space: nowrap;
+    flex-shrink: 0;
+    margin-right: 20px;
+}
+
 .admin-interface .streamfield_app .stream-model-block .streamblock__block__title span {
     font-size: 18px;
 }
@@ -139,6 +145,16 @@ https://github.com/raagin/django-streamfield/
     font-size: 18px;
 }
 
+.admin-interface .streamfield_app .stream-model-block .streamblock__block__subtitle {
+    display: -webkit-box;
+    -webkit-box-orient: vertical;
+    -webkit-line-clamp: 2;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    flex-shrink: 1;
+    margin-right: 10px;
+}
+
 .admin-interface .streamfield_app .block-fields > div {
     margin-bottom: 15px;
 }
@@ -152,6 +168,10 @@ https://github.com/raagin/django-streamfield/
     display: none;
 }
 
+.admin-interface .streamfield_app .stream-model-block .add_here {
+    display: none !important;
+}
+
 .admin-interface .streamfield_app .stream-insert-new-block {
     margin-bottom: 20px;
 }
@@ -163,7 +183,7 @@ https://github.com/raagin/django-streamfield/
 
 .admin-interface .streamfield_app .stream-insert-new-block .add-new-block-button:hover {
     color: var(--admin-interface-generic-link-hover-color);
-    text-decoration: none;
+    text-decoration: underline;
 }
 
 .admin-interface .streamfield_app .stream-insert-new-block ul {

admin_interface/static/streamfield/admin_popup_response.js

@@ -0,0 +1,24 @@
+// IMPORTANT: used by django-streamfield >= 2.0.0
+
+(function() {
+
+    'use strict';
+
+    var windowRef = window;
+    var openerRef = windowRef.parent;
+
+    var initData = JSON.parse(document.getElementById('django-admin-popup-response-constants').dataset.popupResponse);
+    switch (initData.action) {
+        case 'change':
+            openerRef.streamapps[initData.app_id].updateBlock(initData.block_id, initData.instance_id);
+            openerRef.dismissRelatedObjectModal();
+            break;
+        case 'delete':
+            break;
+        default:
+            openerRef.streamapps[initData.app_id].updateBlock(initData.block_id, initData.instance_id);
+            openerRef.dismissRelatedObjectModal();
+            break;
+    }
+
+})();

admin_interface/static/streamfield/js/admin_popup_response.js

@@ -1,3 +1,5 @@
+// IMPORTANT: used by django-streamfield >= 2.0.0
+
 (function() {
 
     'use strict';