Address PR review comments.

cylc/flow/task_pool.py

@@ -332,15 +332,13 @@ def release_runahead_tasks(self):
 
         # An intermediate list is needed here: auto-spawning of parentless
         # tasks can cause the task pool to change size during iteration.
-        release_me = []
-        for itask in (
+        release_me = [
             itask
             for point, itask_id_map in self.main_pool.items()
             for itask in itask_id_map.values()
             if point <= runahead_limit_point
             if itask.state.is_runahead
-        ):
-            release_me.append(itask)
+        ]
 
         for itask in release_me:
             self.release_runahead_task(itask, runahead_limit_point)

cylc/flow/taskdef.py

@@ -282,9 +282,8 @@ def has_only_abs_triggers(self, point):
         """Return whether I have only absolute triggers at point."""
         if not self.has_abs_triggers:
             return False
-        # Has abs triggers somewhere, but need to check the specific point.
+        # Has abs triggers somewhere, but need to check at point.
         has_abs = False
-        has_other = False
         for seq in self.sequences:
             if not seq.is_valid(point) or seq not in self.dependencies:
                 continue
@@ -296,8 +295,8 @@ def has_only_abs_triggers(self, point):
                     ):
                         has_abs = True
                     else:
-                        has_other = True
-        return has_abs and not has_other
+                        return False
+        return has_abs
 
     def is_valid_point(self, point):
         """Return True if point is on-sequence and within bounds."""

tests/integration/test_task_pool.py

@@ -25,8 +25,8 @@
 from cylc.flow.scheduler import Scheduler
 
 
-# NOTE: foo & bar have no parents so when released from the hidden pool at
-# start-up (with workflow paused) the next instances are spawned (to hidden).
+# NOTE: foo & bar have no parents so at start-up (even with the workflow
+# paused) they are spawned out to the runahead limit.
 EXAMPLE_FLOW_CFG = {
     'scheduler': {
         'allow implicit tasks': True