Program: 3852
Project: 3852
Buggy source:
public void performAction(final String actionCommmand,final DownloadItem item){
  if (actionCommmand == CANCEL_COMMAND) {
    item.cancel();
  }
 else   if (actionCommmand == PAUSE_COMMAND) {
    item.pause();
  }
 else   if (actionCommmand == RESUME_COMMAND) {
    item.resume();
  }
 else   if (actionCommmand == TRY_AGAIN_COMMAND) {
    item.resume();
  }
 else   if (actionCommmand == LINK_COMMAND) {
  }
 else   if (actionCommmand == PREVIEW_COMMAND || actionCommmand == LAUNCH_COMMAND || actionCommmand == PLAY_COMMAND) {
    if (item.isLaunchable()) {
      DownloadItemUtils.launch(item);
    }
  }
 else   if (actionCommmand == LOCATE_COMMAND) {
    NativeLaunchUtils.launchExplorer(item.getDownloadingFile());
  }
 else   if (actionCommmand == PROPERTIES_COMMAND) {
    if (item.getState() != DownloadState.DONE) {
      propertiesFactory.newProperties().showProperties(item);
    }
 else {
      LocalFileItem localItem=libraryManager.getLibraryManagedList().getFileItem(item.getLaunchableFile());
      if (localItem != null)       localItemFactory.newProperties().showProperties(localItem);
 else       propertiesFactory.newProperties().showProperties(item);
    }
  }
 else   if (actionCommmand == REMOVE_COMMAND) {
    downloadListManager.remove(item);
  }
 else   if (actionCommmand == SHARE_COMMAND) {
    shareWidget.setShareable(item.getDownloadingFile());
    shareWidget.show(null);
  }
 else   if (actionCommmand == LIBRARY_COMMAND) {
    File file=item.getState() == DownloadState.DONE ? item.getLaunchableFile() : item.getDownloadingFile();
    URN urn=item.getUrn();
    Category category=item.getCategory();
    if (file != null) {
      libraryNavigator.selectInLibrary(file,category);
    }
 else     if (urn != null) {
      libraryNavigator.selectInLibrary(urn,category);
    }
  }
}

Fixed version (ground truth):
public void performAction(final String actionCommmand,final DownloadItem item){
  if (actionCommmand == CANCEL_COMMAND) {
    item.cancel();
  }
 else   if (actionCommmand == PAUSE_COMMAND) {
    item.pause();
  }
 else   if (actionCommmand == RESUME_COMMAND) {
    item.resume();
  }
 else   if (actionCommmand == TRY_AGAIN_COMMAND) {
    item.resume();
  }
 else   if (actionCommmand == LINK_COMMAND) {
  }
 else   if (actionCommmand == PREVIEW_COMMAND || actionCommmand == LAUNCH_COMMAND || actionCommmand == PLAY_COMMAND) {
    if (item.isLaunchable()) {
      DownloadItemUtils.launch(item);
    }
  }
 else   if (actionCommmand == LOCATE_COMMAND) {
    NativeLaunchUtils.launchExplorer(item.getDownloadingFile());
  }
 else   if (actionCommmand == PROPERTIES_COMMAND) {
    if (item.getState() != DownloadState.DONE) {
      fileInfoFactory.createFileInfoDialog(item,FileInfoType.DOWNLOADING_FILE);
    }
 else {
      LocalFileItem localItem=libraryManager.getLibraryManagedList().getFileItem(item.getLaunchableFile());
      if (localItem != null)       fileInfoFactory.createFileInfoDialog(localItem,FileInfoType.LOCAL_FILE);
 else       fileInfoFactory.createFileInfoDialog(item,FileInfoType.DOWNLOADING_FILE);
    }
  }
 else   if (actionCommmand == REMOVE_COMMAND) {
    downloadListManager.remove(item);
  }
 else   if (actionCommmand == SHARE_COMMAND) {
    shareWidget.setShareable(item.getDownloadingFile());
    shareWidget.show(null);
  }
 else   if (actionCommmand == LIBRARY_COMMAND) {
    File file=item.getState() == DownloadState.DONE ? item.getLaunchableFile() : item.getDownloadingFile();
    URN urn=item.getUrn();
    Category category=item.getCategory();
    if (file != null) {
      libraryNavigator.selectInLibrary(file,category);
    }
 else     if (urn != null) {
      libraryNavigator.selectInLibrary(urn,category);
    }
  }
}