private @NlsContexts.Tooltip @Nullable String getToolTip(int lineNumber, boolean asHtml) {
    final CommitInfo info = myInfos.getOrNull(lineNumber);
    if (info == null) return null;

    SvnFileRevision revision = myRevisionMap.get(info.getRevisionNumber());
    if (revision == null) return null;

    String prefix = myInfos.getAnnotationSource(lineNumber).showMerged()
                    ? SvnBundle.message("label.merge.source.revision")
                    : SvnBundle.message("label.revision");
    return buildSimpleTooltip(getProject(), asHtml, prefix, String.valueOf(info.getRevisionNumber()), revision.getCommitMessage());
  }
private @NlsContexts.Tooltip @Nullable String getToolTip(int lineNumber, boolean asHtml)