[6.2] Detailed Error-Message when upload of SVG-Files is not possible

[jgerman-bot]

New language relevant PR in upstream repo: joomla/joomla-cms#48204 Here are the upstream changes:

Click to expand the diff!

diff --git a/administrator/language/en-GB/lib_joomla.ini b/administrator/language/en-GB/lib_joomla.ini
index e955da5226c69..cbb1f370ea2de 100644
--- a/administrator/language/en-GB/lib_joomla.ini
+++ b/administrator/language/en-GB/lib_joomla.ini
@@ -709,6 +709,8 @@ JLIB_MAIL_FUNCTION_DISABLED="The mail() function has been disabled and the mail
 JLIB_MAIL_FUNCTION_OFFLINE="The mail function has been disabled by an administrator."
 JLIB_MAIL_INVALID_EMAIL_SENDER="Invalid email sender: %s"
 
+JLIB_MEDIA_ERROR_SVG_ISSUE="SVG Issue: %s"
+JLIB_MEDIA_ERROR_SVG_UNKNOWN="Unknown SVG error"
 JLIB_MEDIA_ERROR_UPLOAD_INPUT="Unable to upload file."
 JLIB_MEDIA_ERROR_WARNFILENAME="File name must only have alphanumeric characters and no spaces."
 JLIB_MEDIA_ERROR_WARNFILETOOLARGE="This file is too large to upload. You can change the limits for your site in the component options."
diff --git a/language/en-GB/lib_joomla.ini b/language/en-GB/lib_joomla.ini
index ce6e39e4516ba..105557192ced8 100644
--- a/language/en-GB/lib_joomla.ini
+++ b/language/en-GB/lib_joomla.ini
@@ -695,6 +695,8 @@ JLIB_MAIL_FUNCTION_DISABLED="The mail() function has been disabled and the mail
 JLIB_MAIL_FUNCTION_OFFLINE="The mail function has been disabled by an administrator."
 JLIB_MAIL_INVALID_EMAIL_SENDER="Invalid email sender: %s"
 
+JLIB_MEDIA_ERROR_SVG_ISSUE="SVG Issue: %s"
+JLIB_MEDIA_ERROR_SVG_UNKNOWN="Unknown SVG error"
 JLIB_MEDIA_ERROR_UPLOAD_INPUT="Unable to upload file."
 JLIB_MEDIA_ERROR_WARNFILENAME="File name must only have alphanumeric characters and no spaces."
 JLIB_MEDIA_ERROR_WARNFILETOOLARGE="This file is too large to upload."
diff --git a/libraries/src/Helper/MediaHelper.php b/libraries/src/Helper/MediaHelper.php
index 623b8e5976851..00f8893c29e68 100644
--- a/libraries/src/Helper/MediaHelper.php
+++ b/libraries/src/Helper/MediaHelper.php
@@ -519,7 +519,22 @@ private static function isValidSvg($file, $shouldLogErrors = true): bool
 
         if ($isValid === false || \count($svgErrors)) {
             if ($shouldLogErrors) {
-                Factory::getApplication()->enqueueMessage(Text::_('JLIB_MEDIA_ERROR_WARNIEXSS'), 'error');
+                $messages = [];
+
+                foreach ($svgErrors as $error) {
+                    $messages[] = Text::sprintf(
+                        'JLIB_MEDIA_ERROR_SVG_ISSUE',
+                        htmlspecialchars($error['message'] ?? Text::_('JLIB_MEDIA_ERROR_SVG_UNKNOWN'), ENT_QUOTES, 'UTF-8')
+                    );
+                }
+
+                $messageText = Text::_('JLIB_MEDIA_ERROR_WARNIEXSS');
+
+                if (!empty($messages)) {
+                    $messageText .= '<br>' . implode('<br>', $messages);
+                }
+
+                Factory::getApplication()->enqueueMessage($messageText, 'error');
             }
 
             return false;