add workflow_id to sysargv for play step if it isn't there

cylc/flow/option_parsers.py

@@ -814,9 +814,11 @@ def cleanup_sysargv(
     # replace source path with workflow ID.
     if str(source) in sys.argv:
         sys.argv.remove(str(source))
+    if workflow_id not in sys.argv:
         sys.argv.append(workflow_id)
 
 
+
 def log_subcommand(command, workflow_id):
     """Log a command run as part of a sequence.
 

tests/unit/test_option_parsers.py

@@ -382,6 +382,21 @@ def test_combine_options(inputs, expect):
             'play --foo something myworkflow'.split(),
             id='replace path'
         ),
+        param(
+            'vip --foo something'.split(),
+            {
+                'script_name': 'play',
+                'workflow_id': 'myworkflow',
+                'compound_script_opts': [
+                    OptionSettings(['--foo', '-f'])],
+                'script_opts': [
+                    OptionSettings(['--foo', '-f']),
+                ],
+                'source': './myworkflow',
+            },
+            'play --foo something myworkflow'.split(),
+            id='no path given'
+        ),
     ]
 )
 def test_cleanup_sysargv(monkeypatch, argv_before, kwargs, expect):
@@ -510,4 +525,4 @@ def test__in_list():
         first = OptionSettings(['--foo'])
         second = OptionSettings(['--foo'])
         third = OptionSettings(['--bar'])
-        assert first._in_list([second, third]) == True
+        assert first._in_list([second, third]) is True