/*
 * Copyright 2000-2013 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.intellij.codeInsight.lookup.impl;

import com.intellij.codeInsight.lookup.LookupManager;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.fileEditor.FileDocumentSynchronizationVetoer;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.project.ProjectManager;
import com.intellij.openapi.vfs.VirtualFile;
import org.jetbrains.annotations.NotNull;

/**
 * @author peter
 */
public class LookupDocumentSavingVetoer implements FileDocumentSynchronizationVetoer {
  @Override
  public boolean maySaveDocument(@NotNull Document document) {
    for (Project project : ProjectManager.getInstance().getOpenProjects()) {
      if (!project.isInitialized() || project.isDisposed()) {
        continue;
      }
      if (LookupManager.getInstance(project).getActiveLookup() != null) {
        return false;
      }
    }
    return true;
  }

  @Override
  public boolean mayReloadFileContent(VirtualFile file, @NotNull Document document) {
    return true;
  }
}

@@ -690,60 +690,327 @@
 okup
-Manager;%0Aimport com.intellij.openapi.editor.Document
+;%0Aimport com.intellij.codeInsight.lookup.LookupEx;%0Aimport com.intellij.codeInsight.lookup.LookupManager;%0Aimport com.intellij.openapi.application.ApplicationManager;%0Aimport com.intellij.openapi.editor.Document;%0Aimport com.intellij.openapi.editor.Editor;%0Aimport com.intellij.openapi.editor.ex.EditorSettingsExternalizable
 ;%0Aim
@@ -1219,24 +1219,96 @@
 irtualFile;%0A
+import com.intellij.psi.impl.source.tree.injected.InjectedLanguageUtil;%0A
 import org.j
@@ -1521,24 +1521,359 @@
 document) %7B%0A
+    if (ApplicationManager.getApplication().isDisposed()) %7B%0A      return true;%0A    %7D%0A%0A    final EditorSettingsExternalizable settings = EditorSettingsExternalizable.getInstance();%0A    if (settings == null %7C%7C EditorSettingsExternalizable.STRIP_TRAILING_SPACES_NONE.equals(settings.getStripTrailingSpaces())) %7B%0A      return true;%0A    %7D%0A%0A
     for (Pro
@@ -2031,20 +2031,34 @@
 %7D%0A      
-if (
+LookupEx lookup = 
 LookupMa
@@ -2105,70 +2105,682 @@
 up()
- != null) %7B%0A        return false;%0A      %7D%0A    %7D%0A    return tru
+;%0A      if (lookup != null && isInTrailingSpace(lookup, document)) %7B%0A        return false;%0A      %7D%0A    %7D%0A    return true;%0A  %7D%0A%0A  private static boolean isInTrailingSpace(Lookup lookup, Document document) %7B%0A    Editor editor = InjectedLanguageUtil.getTopLevelEditor(lookup.getEditor());%0A    if (editor.getDocument() != document) %7B%0A      return false;%0A    %7D%0A%0A    int caret = editor.getCaretModel().getOffset();%0A    if (caret %3C= 0 %7C%7C caret %3E= document.getTextLength()) %7B%0A      return false;%0A    %7D%0A%0A    CharSequence seq = document.getCharsSequence();%0A    if (seq.charAt(caret) == '%5Cn' && Character.isWhitespace(seq.charAt(caret - 1))) %7B%0A      return true;%0A    %7D%0A%0A    return fals
 e;%0A 

allow to save documents with lookup open unless trailing whitespace stripping will really cause the lookup to close (IDEA-101293)