Lazily load attachments

see #3980

diff --git a/wcfsetup/install/files/lib/system/bbcode/AttachmentBBCode.class.php b/wcfsetup/install/files/lib/system/bbcode/AttachmentBBCode.class.php
index 5fe770b73af4b86f7e21a2563f238b7c5fb25b73..454aa88896b869cf3880cd8175e7ac47b860332a 100644 (file)
--- a/wcfsetup/install/files/lib/system/bbcode/AttachmentBBCode.class.php
+++ b/wcfsetup/install/files/lib/system/bbcode/AttachmentBBCode.class.php
@@ -155,7 +155,7 @@ class AttachmentBBCode extends AbstractBBCode
                         $result = '<img src="' . StringUtil::encodeHTML(LinkHandler::getInstance()->getLink(
                             'Attachment',
                             $linkParameters
-                        )) . '"' . ($imageClasses ? ' class="' . $imageClasses . '"' : '') . ' width="' . ($attachment->hasThumbnail() ? $attachment->thumbnailWidth : $attachment->width) . '" height="' . ($attachment->hasThumbnail() ? $attachment->thumbnailHeight : $attachment->height) . '" alt="">';
+                        )) . '"' . ($imageClasses ? ' class="' . $imageClasses . '"' : '') . ' width="' . ($attachment->hasThumbnail() ? $attachment->thumbnailWidth : $attachment->width) . '" height="' . ($attachment->hasThumbnail() ? $attachment->thumbnailHeight : $attachment->height) . '" alt="" loading="lazy">';
                     }
                     if (!$hasParentLink && $attachment->hasThumbnail() && $attachment->canDownload()) {
                         $result = '<a href="' . StringUtil::encodeHTML(LinkHandler::getInstance()->getLink(