resolves asciidoctor#2208 fix calculation of TOC extent when entries …

…have children but no ID

CHANGELOG.adoc

@@ -5,6 +5,12 @@
 This document provides a high-level view of the changes to the {project-name} by release.
 For a detailed view of what has changed, refer to the {url-repo}/commits/main[commit history] on GitHub.
 
+== Unreleased
+
+Bug Fixes::
+
+* fix calculation of TOC extent when TOC entry has children but no ID (#2208)
+
 == 2.0.3 (2022-05-25) - @mojavelinux
 
 Improvements::

lib/asciidoctor/pdf/converter.rb

@@ -3756,9 +3756,9 @@ def ink_toc_level entries, num_levels, dot_leader, num_front_matter_pages
         hanging_indent = @theme.toc_hanging_indent
         entries.each do |entry|
           next if (num_levels_for_entry = (entry.attr 'toclevels', num_levels).to_i) < (entry_level = entry.level + 1).pred ||
-            !(entry_anchor = (entry.attr 'pdf-anchor') || entry.id) ||
             ((entry.option? 'notitle') && entry == entry.document.last_child && entry.empty?)
           theme_font :toc, level: entry_level do
+            next unless (entry_anchor = (entry.attr 'pdf-anchor') || entry.id)
             entry_title = entry.context == :section ? entry.numbered_title : (entry.title? ? entry.title : (entry.xreftext 'basic'))
             next if entry_title.empty?
             entry_title = transform_text entry_title, @text_transform if @text_transform

spec/toc_spec.rb

@@ -221,6 +221,30 @@
       (expect pdf.pages[3][:strings]).to include 'Chapter 1'
     end
 
+    it 'should render descendants of section without ID when computing extent of TOC' do
+      input = <<~EOS
+      = Document Title
+      :doctype: book
+      :pdf-page-size: A5
+      :toc:
+
+      the preface
+
+      :!sectids:
+      == Chapter 1
+      :sectids:
+
+      #{5.times.map {|idx| %(=== Section #{idx + 1}) }.join ?\n}
+
+      #{21.times.map {|idx| %(== Chapter #{idx + 2}) }.join ?\n}
+      EOS
+
+      pdf = to_pdf input, analyze: true
+      preface_text = pdf.find_unique_text 'the preface'
+      last_toc_entry_text = (pdf.find_text 'Chapter 22')[0]
+      (expect preface_text[:page_number]).to be > last_toc_entry_text[:page_number]
+    end
+
     it 'should insert toc after preamble if toc attribute is preamble' do
       pdf = to_pdf <<~'EOS', analyze: true
       = Document Title