comctl32: Monthcal lost focus fix.

dlls/comctl32/monthcal.c

@@ -1719,11 +1719,14 @@ MONTHCAL_Paint(MONTHCAL_INFO *infoPtr, WPARAM wParam)
 
 
 static LRESULT
-MONTHCAL_KillFocus(const MONTHCAL_INFO *infoPtr)
+MONTHCAL_KillFocus(const MONTHCAL_INFO *infoPtr, HWND hFocusWnd)
 {
   TRACE("\n");
 
-  InvalidateRect(infoPtr->hwndSelf, NULL, TRUE);
+  if (infoPtr->hwndNotify != hFocusWnd)
+    ShowWindow(infoPtr->hwndSelf, SW_HIDE);
+  else
+    InvalidateRect(infoPtr->hwndSelf, NULL, TRUE);
 
   return 0;
 }
@@ -2031,7 +2034,7 @@ MONTHCAL_WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
     return DLGC_WANTARROWS | DLGC_WANTCHARS;
 
   case WM_KILLFOCUS:
-    return MONTHCAL_KillFocus(infoPtr);
+    return MONTHCAL_KillFocus(infoPtr, (HWND)wParam);
 
   case WM_RBUTTONDOWN:
     return MONTHCAL_RButtonDown(infoPtr, lParam);