Add a kbi fast daemon cancel test

tests/test_cancellation.py

@@ -501,3 +501,20 @@ async def main():
 
     with pytest.raises(AssertionError):
         trio.run(main)
+
+
+def test_fast_cancel_when_spawn_task_in_soft_proc_wait_for_daemon(
+    start_method,
+):
+    async def main():
+        with trio.fail_after(2):
+            async with tractor.open_nursery() as tn:
+                p = await tn.start_actor(
+                    'fast_boi',
+                    enable_modules=[__name__],
+                )
+                await p.run(do_nuthin)
+                raise KeyboardInterrupt
+
+    with pytest.raises(KeyboardInterrupt):
+        trio.run(main)