fix

.github/mergify.yml

@@ -1,17 +1,22 @@
+# https://docs.mergify.com/merge-queue/lifecycle/
+# The merge queue tests pull requests against the latest version of the base branch. Therefore, if a new commit is pushed to the base branch, Mergify resets the process and starts over with the updated base branch.
+
+# https://docs.mergify.com/configuration/file-format/
 pull_request_rules:
   - name: "Automatic queue when CI passes and approved"
     conditions:
+      # Mergify receives an PR event(`opened``, `reopened`` and etc.), does some actions(`queue` here) if following conditions are all true.
       - "#approved-reviews-by>=0"
       - "check-success=tests"
     actions:
       queue:
-        merge_method: squash
-        update_method: rebase
 queue_rules:
   - name: default
     queue_conditions:
-      - and:
-        - "#approved-reviews-by>=0"
-        - "check-success=tests"
+      # Mergify receives `queue` or `requeue` command, queues the PR if following conditions are all true.
+      - "#approved-reviews-by>=0"
+      - "check-success=tests"
     merge_conditions:
       - "check-success=tests"
+    merge_method: squash
+    update_method: rebase