src/java.desktop/windows/native/libawt/windows/awt_Component.cpp

*** 1,7 ****
  /*
!  * Copyright (c) 1996, 2016, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
--- 1,7 ----
  /*
!  * Copyright (c) 1996, 2017, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
*** 3809,3818 ****
--- 3809,3821 ----
  void AwtComponent::OpenCandidateWindow(int x, int y)
  {
      UINT bits = 1;
      POINT p = {0, 0}; // upper left corner of the client area
      HWND hWnd = GetHWnd();
+     if (!::IsWindowVisible(hWnd)) {
+         return;
+     }
      HWND hTop = GetTopLevelParentForWindow(hWnd);
      ::ClientToScreen(hTop, &p);
      if (!m_bitsCandType) {
          SetCandidateWindow(m_bitsCandType, x - p.x, y - p.y);
          return;
*** 4081,4090 ****
--- 4084,4096 ----
  //
  // Inquires candidate position according to the composed text
  //
  void AwtComponent::InquireCandidatePosition()
  {
+     if (!::IsWindowVisible(GetHWnd())) {
+         return;
+     }
      JNIEnv *env = (JNIEnv *)JNU_GetEnv(jvm, JNI_VERSION_1_2);
  
      // get global reference of WInputMethod class (run only once)
      static jclass wInputMethodCls = NULL;
      if (wInputMethodCls == NULL) {