Issue #3365151: CollectPathsToExcludeEvent needs to exclude paths relative to the project root prefixed with './' so they are not ambiguous to rsync

package_manager/src/Event/CollectPathsToExcludeEvent.php

@@ -105,12 +105,18 @@ final class CollectPathsToExcludeEvent extends StageEvent implements PathListInt
       // Make absolute paths relative to the project root, prefixed with `./`
       // so that they're totally unambiguous. A path like
       // `/path/to/project/file.php` should become `/file.php`.
-      $path = str_replace($project_root, '', $path);
-      if ($path[0] == '/') {
-        $path = '.' . $path;
+      $flag = TRUE;
+      if (is_file($path)) {
+        $flag = FALSE;
       }
-      else {
-        $path = './' . $path;
+      $path = str_replace($project_root, '', $path);
+      if ($flag) {
+        if ($path[0] == '/') {
+          $path = '.' . $path;
+        }
+        else {
+          $path = './' . $path;
+        }
       }
       $this->add([$path]);
     }