fix: preserve syntax errors spanning markdown

Fixes #26

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## master (unreleased)
 
+- Fix analyzing code blocks with backticks.
+
 ## 1.2.1 (2023-10-20)
 
 - Fix incompatibility when loading the plugin from YAML and using other RuboCop options.

lib/rubocop/markdown/rubocop_ext.rb

@@ -17,6 +17,9 @@ module Markdown # :nodoc:
       .workbook
     ].freeze
 
+    # A list of cops that could produce offenses in commented lines
+    MARKDOWN_OFFENSE_COPS = %w[Lint/Syntax].freeze
+
     class << self
       attr_accessor :config_store
 
@@ -61,6 +64,8 @@ def inspect_file(*args)
       # Skip offenses reported for ignored MD source (trailing whitespaces, etc.)
       marker_comment = "##{RuboCop::Markdown::Preprocess::MARKER}"
       offenses.reject! do |offense|
+        next if RuboCop::Markdown::MARKDOWN_OFFENSE_COPS.include?(offense.cop_name)
+
         offense.location.source_line.start_with?(marker_comment)
       end
     end

test/fixtures/backticks.md

@@ -0,0 +1,7 @@
+```ruby
+`method_call
+```
+
+```ruby
+further_code("", '')
+```

test/integration_test.rb

@@ -122,6 +122,13 @@ def test_non_code_offenses
     assert_match %r{Inspecting 1 file}, res
     assert_match %r{no offenses detected}, res
   end
+
+  def test_backticks_in_code
+    res = run_rubocop("backticks.md")
+
+    assert_match %r{Inspecting 1 file}, res
+    assert_match %r{1 offense detected}, res
+  end
 end
 
 class RuboCop::Markdown::AutocorrectTest < Minitest::Test