fix: Ensure dotfiles are always filtered

Author: effigies

src/bids/layout/validation.py

@@ -32,9 +32,12 @@
 
 DEFAULT_LOCATIONS_TO_IGNORE = {
     re.compile(r"^/(code|models|sourcedata|stimuli)"),
-    re.compile(r'/\.'),
 }
 
+ALWAYS_IGNORE = (
+    re.compile(r'/\.'),  # dotfiles should never be indexed
+)
+
 def absolute_path_deprecation_warning():
     warnings.warn("The absolute_paths argument will be removed from PyBIDS "
                   "in 0.14. You can easily access the relative path of "
@@ -160,6 +163,8 @@ def validate_indexing_args(ignore, force_index, root):
             DEFAULT_LOCATIONS_TO_IGNORE - set(force_index or [])
         )
 
+    ignore.extend(ALWAYS_IGNORE)
+
     # root has already been validated to be a directory
     ignore = _sort_patterns(ignore, root)
     force_index = _sort_patterns(force_index or [], root)