@Override
            public @NotNull Result visitFileEx(@NotNull VirtualFile file) {
              boolean ignored = ReadAction.compute(() -> fileIndex.isExcluded(file));
              if (!ignored && !file.isDirectory()) {
                fileSet.add(file);
              }
              return ignored ? SKIP_CHILDREN : CONTINUE;
            }
@Override
            public @NotNull Result visitFileEx(@NotNull VirtualFile file)