Fix the way handlers are compiled and found/notified

* Instead of rebuilding the handler list all over the place, we now
  compile the handlers at the point the play is post-validated so that
  the view of the play in the PlayIterator contains the definitive list
* Assign the dep_chain to the handlers as they're compiling, just as we
  do for regular tasks
* Clean up the logic used to find a given handler, which is greatly
  simplified by the above changes

Fixes #15418

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/ansible/playbook/play.py b/lib/ansible/playbook/play.py
index a85ab7fe64..2031465eef 100644
--- a/lib/ansible/playbook/play.py
+++ b/lib/ansible/playbook/play.py
@@ -265,7 +265,7 @@ class Play(Base, Taggable, Become):
 
         if len(self.roles) > 0:
             for r in self.roles:
-                block_list.extend(r.get_handler_blocks())
+                block_list.extend(r.get_handler_blocks(play=self))
 
         return block_list