[Bug 54192] New: user32:clipboard - SetClipboardData() fails on Windows 11 for size < sizeof(WCHAR)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54192

Bug ID: 54192
           Summary: user32:clipboard - SetClipboardData() fails on Windows
                    11 for size < sizeof(WCHAR)
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: user32
          Assignee: [e-mail]
          Reporter: [e-mail]

user32:clipboard - SetClipboardData() fails on Windows 11 for size <
sizeof(WCHAR):

clipboard.c:2267: Test failed: 8: wrong data L"f"
clipboard.c:2308: Test failed: 8: could not get data
clipboard.c:2310: Test failed: 8: wrong size 0 / 1
clipboard.c:2329: Test failed: 8: text not available

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

In previous Windows versions it would happily terminate the Unicode string with
a single NUL character (at least it's not overflowing the buffer).

Also test_string_data() treats the buffer as a Unicode string, at least when
dumping it in failure cases, which it is clearly not when it's an odd number of
bytes, particularly a single byte. This results in random data going into the
output making it look like the failure is always new:

clipboard.c:2267: Test failed: 8: wrong data L"\7866"