test_logged_ac_process_ffi_failure is flaky

[link2xt]

Not the first time I see this failure.

Attached logs:
job-logs.txt

[Septias]

I ran the test 100times locally and did not notice any flaky behaviour

[link2xt]

Just happened again:
job-logs.txt

[iequidoo]

Again: job-logs.txt
Btw all failures here are on macOS. Failed to reproduce this failure locally on Linux running the test in a loop.

EDIT: Again macOS: job-logs.txt

[link2xt]

The whole failure is essentially this:

acfactory = <deltachat.testplugin.ACFactory object at 0x0000000119a0d5c8>

    def test_logged_ac_process_ffi_failure(acfactory):
        from deltachat import account_hookimpl
    
        ac1 = acfactory.get_pseudo_configured_account()
    
        class FailPlugin:
            @account_hookimpl
            def ac_process_ffi_event(ffi_event):
                0 / 0
    
        cap = Queue()
        ac1.log = cap.put
        ac1.add_account_plugin(FailPlugin())
        # cause any event eg contact added/changed
        ac1.create_contact("[email protected]")
        res = cap.get(timeout=10)
>       assert "ac_process_ffi_event" in res
E       AssertionError: assert 'ac_process_ffi_event' in 'DC_EVENT_ACCOUNTS_ITEM_CHANGED data1=0 data2=0'

tests/test_4_lowlevel.py:220: AssertionError

DC_EVENT_ACCOUNTS_ITEM_CHANGED was logged after setting ac1.log but before setting a fail plugin.

I made a fix at #6403