[Bug 51395] New: user32:win gets an unexpected 0x7fff message in the Korean locale

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=51395

Bug ID: 51395
           Summary: user32:win gets an unexpected 0x7fff message in the
                    Korean locale
           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:win gets an unexpected 0x7fff message in the Korean locale, thus
triggering the following failures:

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

win.c:4005: Test failed: hwnd 0000000001AD0418 message 7fff
win.c:4011: Test failed: message 7fff available
win.c:4040: Test failed: hwnd 0000000000250424/00000000008F01E0 message 0287
win.c:4045: Test failed: hwnd 0000000000250424/00000000008F01E0 message 0287
win.c:4050: Test failed: hwnd 00000000008F01E0/00000000008F01E0 message 0201
win.c:4059: Test failed: message 0203 available
win.c:4071: Test failed: hwnd 0000000000250424/0000000000520450 message 0287
win.c:4075: Test failed: hwnd 0000000000250424/0000000000520450 message 0287
win.c:4084: Test failed: hwnd 0000000001AD0418/00000000008F01E0 message 7fff
win.c:4087: Test failed: hwnd 0000000001AD0418/00000000008F01E0 message 7fff
win.c:4120: Test failed: hwnd 0000000000250424/00000000002303F6 message 0287
win.c:4122: Test failed: wparam 32
win.c:4126: Test failed: hwnd 0000000000250424/00000000002303F6 message 0287
win.c:4133: Test failed: hwnd 00000000002303F6/00000000002303F6 message 0201
win.c:4150: Test failed: message 0203 available

I could not find any documentation about 0x7fff. However changing the keyboard
layout from Korean to Qwerty fixes the issue. So it is likely related to the
Korean IME module.

Unfortunately adding 0x7fff to ignore_message() causes user32:win to get stuck.