user32/tests: Disable IME for msg tests.

dlls/user32/tests/msg.c

@@ -12669,6 +12669,8 @@ START_TEST(msg)
     char **test_argv;
     BOOL ret;
     BOOL (WINAPI *pIsWinEventHookInstalled)(DWORD)= 0;/*GetProcAddress(user32, "IsWinEventHookInstalled");*/
+    HMODULE hModuleImm32;
+    BOOL (WINAPI *pImmDisableIME)(DWORD);
 
     int argc = winetest_get_mainargs( &test_argv );
     if (argc >= 3)
@@ -12682,6 +12684,15 @@ START_TEST(msg)
 
     init_procs();
 
+    hModuleImm32 = LoadLibrary("imm32.dll");
+    if (hModuleImm32) {
+        pImmDisableIME = (void *)GetProcAddress(hModuleImm32, "ImmDisableIME");
+        if (pImmDisableIME)
+            pImmDisableIME(0);
+    }
+    pImmDisableIME = NULL;
+    FreeLibrary(hModuleImm32);
+
     if (!RegisterWindowClasses()) assert(0);
 
     if (pSetWinEventHook)