resolves asciidoctor#4481 preserve paragraph breaks in normal table c…

…ell in manpage output

CHANGELOG.adoc

@@ -64,6 +64,7 @@ Improvements::
 
 Bug Fixes::
 
+  * Preserve paragraph breaks in normal table cell in manpage output (#4481)
   * Escape spaces in include target (using inline passthrough) when generating link from include directive (#4461)
 
 == 2.0.20 (2023-05-18) - @mojavelinux

lib/asciidoctor/converter/manpage.rb

@@ -440,7 +440,7 @@ def convert_table node
             when :literal
               cell_content = %(.nf#{LF}#{manify cell.text, whitespace: :preserve}#{LF}.fi)
             else
-              cell_content = manify cell.content.join, whitespace: :normalize
+              cell_content = cell.content.map {|p| manify p, whitespace: :normalize }.join %(#{LF}.sp#{LF})
             end
             row_text[row_index] << %(#{cell_content}#{LF})
           else # tsec == :head || tsec == :foot

test/manpage_test.rb

@@ -349,6 +349,51 @@
       assert_includes output, %(Oh, here it goes again\nI should have known,\nshould have known,\nshould have known again)
     end
 
+    test 'should preserve break between paragraphs in normal table cell' do
+      input = <<~EOS.chop
+      #{SAMPLE_MANPAGE_HEADER}
+
+      [cols=3*]
+      |===
+      |single paragraph
+      |first paragraph
+
+      second paragraph
+      |foo
+
+      more foo
+
+      even more foo
+      |===
+      EOS
+
+      expected_coda = <<~'EOS'.chop
+      .TS
+      allbox tab(:);
+      lt lt lt.
+      T{
+      .sp
+      single paragraph
+      T}:T{
+      .sp
+      first paragraph
+      .sp
+      second paragraph
+      T}:T{
+      .sp
+      foo
+      .sp
+      more foo
+      .sp
+      even more foo
+      T}
+      .TE
+      .sp
+      EOS
+      output = Asciidoctor.convert input, backend: :manpage
+      assert output.end_with? expected_coda
+    end
+
     test 'should normalize whitespace in a list item' do
       input = <<~EOS.chop
       #{SAMPLE_MANPAGE_HEADER}