@Nullable
  private @NlsContexts.Tooltip String getChangesNotAvailableHint() {
    if (!VcsFacade.getInstance().isFileUnderVcs(myFile)) {
      return CodeInsightBundle.message("tooltip.file.not.under.vcs.root");
    }
    else if (!VcsFacade.getInstance().hasChanges(myFile)) {
      return CodeInsightBundle.message("tooltip.file.was.not.changed.since.last.revision");
    }
    return null;
  }
@Nullable
  private @NlsContexts.Tooltip String getChangesNotAvailableHint()