Use display name cache on getStorageInfo

Signed-off-by: Julius Härtl <jus@bitgrid.net>

Author: juliusknorr

apps/dav/tests/unit/Connector/Sabre/DirectoryTest.php

@@ -288,6 +288,10 @@ public function testGetQuotaInfoUnlimited() {
 				'\OC\Files\Storage\Wrapper\Quota' => false,
 			]);
 
+		$storage->expects($this->once())
+			->method('getOwner')
+			->willReturn('user');
+
 		$storage->expects($this->never())
 			->method('getQuota');
 
@@ -325,6 +329,10 @@ public function testGetQuotaInfoSpecific() {
 				['\OC\Files\Storage\Wrapper\Quota', true],
 			]);
 
+		$storage->expects($this->once())
+			->method('getOwner')
+			->willReturn('user');
+
 		$storage->expects($this->once())
 			->method('getQuota')
 			->willReturn(1000);

lib/private/legacy/OC_Helper.php

@@ -542,11 +542,7 @@ public static function getStorageInfo($path, $rootInfo = null, $includeMountPoin
 		}
 
 		$ownerId = $storage->getOwner($path);
-		$ownerDisplayName = '';
-		$owner = \OC::$server->getUserManager()->get($ownerId);
-		if ($owner) {
-			$ownerDisplayName = $owner->getDisplayName();
-		}
+		$ownerDisplayName = \OC::$server->getUserManager()->getDisplayName($ownerId) ?? '';
 		if (substr_count($mount->getMountPoint(), '/') < 3) {
 			$mountPoint = '';
 		} else {