fix: RuntimeError: dictionary changed size during iteration

Signed-off-by: Jack Cherng <[email protected]>

plugin/phatom_sets_manager.py

@@ -32,6 +32,6 @@ def update_phantom_set(cls, phantom_set_id: str, phantoms: Iterable[sublime.Phan
 
     @classmethod
     def clear(cls) -> None:
-        for phantom_set_id in cls._phantom_sets.keys():
+        for phantom_set_id in tuple(cls._phantom_sets.keys()):
             cls.delete_phantom_set(phantom_set_id)
         cls._phantom_sets = {}