[Bug 53173] New: user32:input - test_Input_mouse() randomly fails to get the expected mouse button or hit-test messages

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=53173

Bug ID: 53173
           Summary: user32:input - test_Input_mouse() randomly fails to
                    get the expected mouse button or hit-test messages
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: user32
          Assignee: [e-mail]
          Reporter: [e-mail]

user32:input - test_Input_mouse() randomly fails to get the expected mouse
button or hit-test messages:

input.c:3398: Test failed: expected WM_LBUTTONDOWN message
input.c:3399: Test failed: expected WM_LBUTTONUP message
input.c:3426: Test failed: expected WM_NCHITTEST message
input.c:3427: Test failed: expected WM_RBUTTONDOWN message
input.c:3428: Test failed: expected WM_RBUTTONUP message
input.c:3457: Test failed: expected WM_LBUTTONDOWN message
input.c:3458: Test failed: expected WM_LBUTTONUP message
input.c:3511: Test failed: expected loop with WM_NCHITTEST messages
input.c:3564: Test failed: expected WM_LBUTTONDOWN message
input.c:3565: Test failed: expected WM_LBUTTONUP message

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

The failure list is always the same except for the first two which are not
always present.

This happened on w7u-2qxl, w86 and most Windows 10 1607+ test configurations up
to 21H2. So it's not a quirk of a specific Windows version.