commit e0b590c50292c367e1c8bffb6f7b2775539e82a1
Author: Aric Stewart <aric@codeweavers.com>
Date:   Tue Oct 2 14:20:35 2012 -0500

    imm32: in ImmIsUIMessage redirect message to default hwnd if no hwnd is specified

diff --git a/dlls/imm32/imm.c b/dlls/imm32/imm.c
index 64933c2..0df4b05 100644
--- a/dlls/imm32/imm.c
+++ b/dlls/imm32/imm.c
@@ -1924,6 +1924,9 @@ BOOL WINAPI ImmIsUIMessageA(
             (msg == WM_MSIME_QUERYPOSITION) ||
             (msg == WM_MSIME_DOCUMENTFEED))
     {
+        if (!hWndIME)
+            hWndIME = ImmGetDefaultIMEWnd(NULL);
+
         if (hWndIME)
             SendMessageA(hWndIME, msg, wParam, lParam);
 
@@ -1954,6 +1957,9 @@ BOOL WINAPI ImmIsUIMessageW(
             (msg == WM_MSIME_QUERYPOSITION) ||
             (msg == WM_MSIME_DOCUMENTFEED))
     {
+        if (!hWndIME)
+            hWndIME = ImmGetDefaultIMEWnd(NULL);
+
         if (hWndIME)
             SendMessageW(hWndIME, msg, wParam, lParam);