backport fix for #3535 nested dlist attached using list continuation …

…should not consume detached paragraph

CHANGELOG.adoc

@@ -20,6 +20,7 @@ This project utilizes semantic versioning.
 
 Bug Fixes::
 
+  * Nested dlist attached using list continuation should not consume detached paragraph (#3535)
   * 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)
 

lib/asciidoctor/parser.rb

@@ -1489,7 +1489,7 @@ def self.read_lines_for_list_item(reader, list_type, sibling_trait = nil, has_te
             (ch0 == '[' && (BlockAttributeLineRx.match? this_line)) || (ch0 == ':' && (AttributeEntryRx.match? this_line))
           buffer << this_line
         else
-          if (nested_list_type = (within_nested_list ? [:dlist] : NESTABLE_LIST_CONTEXTS).find {|ctx| ListRxMap[ctx].match? this_line })
+          if (nested_list_type = (within_nested_list ? [:dlist] : NESTABLE_LIST_CONTEXTS).find {|ctx| ListRxMap[ctx] =~ this_line })
             within_nested_list = true
             if nested_list_type == :dlist && $3.nil_or_empty?
               # get greedy again

test/lists_test.rb

@@ -3108,6 +3108,21 @@
       assert_xpath '//dl//dl/dt[normalize-space(text()) = "label1"]', output, 1
       assert_xpath '//dl//dl/dt/following-sibling::dd/p[text() = "detail1"]', output, 1
     end
+
+    test 'nested dlist attached by list continuation should not consume detached paragraph' do
+      input = <<~'EOS'
+      term:: text
+      +
+      nested term::: text
+
+      paragraph
+      EOS
+      output = convert_string_to_embedded input
+      assert_xpath '//dl', output, 2
+      assert_xpath '//dl//dl', output, 1
+      assert_css '.dlist .paragraph', output, 0
+      assert_css '.dlist + .paragraph', output, 1
+    end
   end
 
   context 'Special lists' do