[Bug 51471] New: user32:input receives unexpected WM_SYSTIMER messages in test_SendInput()

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51471

Bug ID: 51471
           Summary: user32:input receives unexpected WM_SYSTIMER messages
                    in test_SendInput()
           Product: Wine
           Version: 6.10
          Hardware: x86-64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: user32
          Assignee: [e-mail]
          Reporter: [e-mail]

user32:input sometimes receives unexpected WM_SYSTIMER messages in
test_SendInput():

https://test.winehq.org/data/patterns.html#user32:input

input.c:4477: Test failed: SendInput triggered unexpected message 0x118

Notes:
* This is random: there is no machine where it happens systematically; and
different machines don't necessarily have the issue on the same day.

* This does not happen on a specific Windows version though not all seem to be
impacted either. Specifically this issue has been seen on the following
machines:
  win7_newtb-w7u-2qxl
  win7_newtb-w7u-de
  win7_newtb-w7u-el
  win7_newtb-w7u-es
  win7_newtb-w7u-pt-PT
  2008_newtb-w2008s64
  win81_cw-rx460
  win1507_cw-gtx560-1507
  win1507_cw-rx460-1507
  win1909_cw-gtx560-1909
  win2009_cw-gtx560-2009
  win2009_cw-rx460-2009

* Maybe the following article can be useful:
  https://devblogs.microsoft.com/oldnewthing/20160624-00/?p=93745