Program: 7798
Project: 7798
Buggy source:
private ArrayList<String> buildFilterPaths(final IResource[] inResources,final File[] inFiles,final Repository db) throws IllegalStateException {
  final ArrayList<String> paths;
  if (inResources != null) {
    paths=new ArrayList<String>(inResources.length);
    for (    final IResource r : inResources) {
      final RepositoryMapping map=RepositoryMapping.getMapping(r);
      if (map == null)       continue;
      if (db != map.getRepository()) {
        throw new IllegalStateException(UIText.AbstractHistoryCommanndHandler_NoUniqueRepository);
      }
      if (showAllFilter == ShowFilter.SHOWALLFOLDER) {
        final String path=map.getRepoRelativePath(r.getParent());
        if (path != null && path.length() > 0)         paths.add(path);
      }
 else       if (showAllFilter == ShowFilter.SHOWALLPROJECT) {
        final String path=map.getRepoRelativePath(r.getProject());
        if (path != null && path.length() > 0)         paths.add(path);
      }
 else       if (showAllFilter == ShowFilter.SHOWALLREPO) {
      }
 else {
        final String path=map.getRepoRelativePath(r);
        if (path != null && path.length() > 0)         paths.add(path);
      }
    }
  }
 else   if (inFiles != null) {
    IPath workdirPath=new Path(db.getWorkTree().getPath());
    IPath gitDirPath=new Path(db.getDirectory().getPath());
    int segmentCount=workdirPath.segmentCount();
    paths=new ArrayList<String>(inFiles.length);
    for (    File file : inFiles) {
      IPath filePath;
      if (showAllFilter == ShowFilter.SHOWALLFOLDER) {
        filePath=new Path(file.getParentFile().getPath());
      }
 else       if (showAllFilter == ShowFilter.SHOWALLPROJECT || showAllFilter == ShowFilter.SHOWALLREPO) {
        continue;
      }
 else {
        filePath=new Path(file.getPath());
      }
      if (gitDirPath.isPrefixOf(filePath)) {
        throw new IllegalStateException(NLS.bind(UIText.GitHistoryPage_FileOrFolderPartOfGitDirMessage,filePath.toOSString()));
      }
      IPath pathToAdd=filePath.removeFirstSegments(segmentCount).setDevice(null);
      if (!pathToAdd.isEmpty()) {
        paths.add(pathToAdd.toString());
      }
    }
  }
 else {
    paths=new ArrayList<String>(0);
  }
  return paths;
}

Fixed version (ground truth):
private ArrayList<String> buildFilterPaths(final IResource[] inResources,final File[] inFiles,final Repository db) throws IllegalStateException {
  final ArrayList<String> paths;
  if (inResources != null) {
    paths=new ArrayList<String>(inResources.length);
    for (    final IResource r : inResources) {
      final RepositoryMapping map=RepositoryMapping.getMapping(r);
      if (map == null)       continue;
      if (db != map.getRepository()) {
        throw new IllegalStateException(UIText.AbstractHistoryCommanndHandler_NoUniqueRepository);
      }
      if (showAllFilter == ShowFilter.SHOWALLFOLDER) {
        final String path;
        if (r.getParent() instanceof IWorkspaceRoot)         path=map.getRepoRelativePath(r.getProject());
 else         path=map.getRepoRelativePath(r.getParent());
        if (path != null && path.length() > 0)         paths.add(path);
      }
 else       if (showAllFilter == ShowFilter.SHOWALLPROJECT) {
        final String path=map.getRepoRelativePath(r.getProject());
        if (path != null && path.length() > 0)         paths.add(path);
      }
 else       if (showAllFilter == ShowFilter.SHOWALLREPO) {
      }
 else {
        final String path=map.getRepoRelativePath(r);
        if (path != null && path.length() > 0)         paths.add(path);
      }
    }
  }
 else   if (inFiles != null) {
    IPath workdirPath=new Path(db.getWorkTree().getPath());
    IPath gitDirPath=new Path(db.getDirectory().getPath());
    int segmentCount=workdirPath.segmentCount();
    paths=new ArrayList<String>(inFiles.length);
    for (    File file : inFiles) {
      IPath filePath;
      if (showAllFilter == ShowFilter.SHOWALLFOLDER) {
        filePath=new Path(file.getParentFile().getPath());
      }
 else       if (showAllFilter == ShowFilter.SHOWALLPROJECT || showAllFilter == ShowFilter.SHOWALLREPO) {
        continue;
      }
 else {
        filePath=new Path(file.getPath());
      }
      if (gitDirPath.isPrefixOf(filePath)) {
        throw new IllegalStateException(NLS.bind(UIText.GitHistoryPage_FileOrFolderPartOfGitDirMessage,filePath.toOSString()));
      }
      IPath pathToAdd=filePath.removeFirstSegments(segmentCount).setDevice(null);
      if (!pathToAdd.isEmpty()) {
        paths.add(pathToAdd.toString());
      }
    }
  }
 else {
    paths=new ArrayList<String>(0);
  }
  return paths;
}