[Bug 55451] New: Application gets WM_IME_COMPOSITION without getting WM_IME_STARTCOMPOSITION before

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=55451

Bug ID: 55451
           Summary: Application gets WM_IME_COMPOSITION without getting
                    WM_IME_STARTCOMPOSITION before
           Product: Wine
           Version: 8.13
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 75009
  --> https://bugs.winehq.org/attachment.cgi?id=75009
This program can reproduce the problem

On wine 8.8 there isn't such a problem.
On wine >=8.9 <=8.13, when the user uses input method to input something, the
program gets some WM_IME_SETCONTEXT (0x281) messages first, and then gets
WM_IME_NOTIFY (0x282, with IMN_WINE_SET_COMP_STRING 0x10), and then gets
WM_IME_COMPOSITION (0x10f). There isn't a WM_IME_STARTCOMPOSITION (0x10d) sent
before WM_IME_COMPOSITION. And after WM_IME_COMPOSITION, there isn't
WM_IME_ENDCOMPOSITION (0x10e) either.