[Bug 55762] New: mshtml:script - test_sync_xhr() sometimes gets events in unexpected order in Wine

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=55762

Bug ID: 55762
           Summary: mshtml:script - test_sync_xhr() sometimes gets events
                    in unexpected order in Wine
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mshtml
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

mshtml:script - test_sync_xhr() sometimes gets events in an unexpected order in
Wine:

script.c:4710: Running xhr.js script in 9 mode...
script.c:4266: Test marked todo: tymed = 1
[...]
script.c:1141: Test failed: L"/index.html?xhr.js: [iframes 2] unexpected order:
0,1,echo,sync_xhr(pre-send),sync_xhr(DONE),sync_xhr"

or

script.c:4710: Running xhr.js script in 10 mode...
script.c:4266: Test marked todo: tymed = 1
[...]
script.c:1141: Test failed: L"/index.html?xhr.js: [iframes 2] unexpected order:
0,1,echo,sync_xhr(pre-send),sync_xhr(DONE),sync_xhr,blank(DONE)"

or

script.c:4710: Running xhr.js script in 11 mode...
script.c:1141: Test failed: L"/index.html?xhr.js: [iframes 2] unexpected order:
0,1,echo,sync_xhr(pre-send),sync_xhr(DONE),sync_xhr,blank(DONE)"

See https://test.winehq.org/data/patterns.html#mshtml:script

Somehow these never happen on the TestBot VMs but they happen regularly on my
fg-deb64 development machine, fgtb test VMs and on Remi's cloud Linux test
configurations.
On 2023-10-09 it also impacted MR!4050 on the GitLab CI.