[PATCH 03/19] python: backport 'kick event queue on legacy event_pull()'

[John Snow]

This corrects an oversight in qmp-shell operation where new events will
not accumulate in the event queue when pressing "enter" with an empty
command buffer, so no new events show up.

Reported-by: Jag Raman <jag.ra...@oracle.com>
Signed-off-by: John Snow <js...@redhat.com>
cherry picked from commit 0443582d16cf9efd52b2c41a7b5be7af42c856cd
---
 python/qemu/qmp/legacy.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/python/qemu/qmp/legacy.py b/python/qemu/qmp/legacy.py
index 22a2b5616ef..c8d0a29b56f 100644
--- a/python/qemu/qmp/legacy.py
+++ b/python/qemu/qmp/legacy.py
@@ -231,6 +231,9 @@ def pull_event(self,
 
         :return: The first available QMP event, or None.
         """
+        # Kick the event loop to allow events to accumulate
+        self._sync(asyncio.sleep(0))
+
         if not wait:
             # wait is False/0: "do not wait, do not except."
             if self._qmp.events.empty():
-- 
2.50.1