EditTag: allow updating the thumbnail visually

templates/FeaturedThumbnailManager.php

@@ -20,6 +20,8 @@ class FeaturedThumbnailManager extends SubTemplate
 	protected function html_content()
 	{
 		echo '
+		<form action="" method="post">
+			<button class="btn btn-primary float-end" type="submit" name="changeThumbnail">Save thumbnail selection</button>
 			<h2>Select thumbnail</h2>
 			<ul id="featuredThumbnail">';
 
@@ -37,6 +39,8 @@ class FeaturedThumbnailManager extends SubTemplate
 		$this->assets->clean();
 
 		echo '
-				</ul>';
+				</ul>
+				<input type="hidden" name="', Session::getSessionTokenKey(), '" value="', Session::getSessionToken(), '">
+			</form>';
 	}
 }