debug: Try to fix tests

Signed-off-by: Louis Chemineau <louis@chmn.me>

lib/private/Files/Cache/Updater.php

@@ -200,8 +200,14 @@ private function copyOrRenameFromStorage(IStorage $sourceStorage, string $source
 		$sourceInfo = $sourceCache->get($source);
 
 		if ($sourceInfo !== false) {
+			// Remove existing cache entry to no reuse the fileId.
 			if ($this->cache->inCache($target)) {
-				$this->cache->remove($target);
+				$existingCacheInfo = $this->cache->get($target);
+				// Do not remove the existing target if it has just been created.
+				// It was probably created by the same operation and we want to keep the fileId.
+				if (time() - $existingCacheInfo->getMTime() > 1) {
+					$this->cache->remove($target);
+				}
 			}
 
 			$operation($sourceCache, $sourceInfo);