private static @Nullable GitRevisionNumber getMergeBase(@NotNull Project project, @NotNull VirtualFile root,
                                                @NotNull GitBranch currentBranch, @NotNull GitBranch branch) throws VcsException {
    return GitHistoryUtils.getMergeBase(project, root, currentBranch.getFullName(), branch.getFullName());
  }
private static @Nullable GitRevisionNumber getMergeBase(@NotNull Project project, @NotNull VirtualFile root,
                                                @NotNull GitBranch currentBranch, @NotNull GitBranch branch)