private @NotNull MultiMap<VirtualFile, GitConflict> groupConflictsByRoot(@NotNull List<? extends VirtualFile> files) {
      MultiMap<VirtualFile, GitConflict> byRoot = MultiMap.create();
      for (VirtualFile file: files) {
        GitConflict c = myConflicts.get(file);
        if (c == null) {
          LOG.error("Conflict was not loaded for the file: " + file.getPath());
          continue;
        }

        byRoot.putValue(c.getRoot(), c);
      }
      return byRoot;
    }
private @NotNull MultiMap<VirtualFile, GitConflict> groupConflictsByRoot(@NotNull List<? extends VirtualFile> files)