imm32: ImmNotifyIMM with CPS_CANCEL fully clears the composition string. Also…

dlls/imm32/imm.c

@@ -1406,14 +1406,17 @@ BOOL WINAPI ImmNotifyIME(
                 case CPS_CANCEL:
                     TRACE("%s - %s\n","NI_COMPOSITIONSTR","CPS_CANCEL");
                     {
-                        HIMCC newCompStr;
+                        BOOL send;
+
                         if (pX11DRV_ForceXIMReset)
                             pX11DRV_ForceXIMReset(root_context->IMC.hWnd);
 
-                        newCompStr = updateCompStr(root_context->IMC.hCompStr, NULL, 0);
+                        send = (root_context->IMC.hCompStr!=NULL);
+
                         ImmDestroyIMCC(root_context->IMC.hCompStr);
-                        root_context->IMC.hCompStr = newCompStr;
+                        root_context->IMC.hCompStr = NULL;
 
+                        if (send)
                             ImmInternalPostIMEMessage(WM_IME_COMPOSITION, 0,
                                                   GCS_COMPSTR);
                         rc = TRUE;

dlls/imm32/tests/imm32.c

@@ -183,11 +183,9 @@ static int test_ImmNotifyIME(void) {
 
     ok(ImmNotifyIME(imc, NI_COMPOSITIONSTR, CPS_CANCEL, 0), "Canceling an "
        "empty composition string succeeds.\n");
-    todo_wine {
     ok(!msg_spy_find_msg(WM_IME_COMPOSITION), "Windows does not post "
        "WM_IME_COMPOSITION in response to NI_COMPOSITIONSTR / CPS_CANCEL, if "
        "the composition string being canceled is empty.\n");
-    }
 
     msg_spy_flush_msgs();
 
@@ -203,11 +201,9 @@ static int test_ImmNotifyIME(void) {
 
     ok(ImmNotifyIME(imc, NI_COMPOSITIONSTR, CPS_CANCEL, 0), "Canceling an "
        "empty composition string succeeds.\n");
-    todo_wine {
     ok(!msg_spy_find_msg(WM_IME_COMPOSITION), "Windows does not post "
        "WM_IME_COMPOSITION in response to NI_COMPOSITIONSTR / CPS_CANCEL, if "
        "the composition string being canceled is empty.\n");
-    }
 
     msg_spy_flush_msgs();
     ImmReleaseContext(hwnd, imc);