Fix encoding

lib/open_project/text_formatting/formats/markdown/pandoc_wrapper.rb

@@ -46,6 +46,7 @@ module OpenProject::TextFormatting::Formats
       end
 
       def check_arguments!
+        PandocDownloader.check_or_download!
         wrap_mode
         read_output_formats
       end
@@ -114,7 +115,9 @@ module OpenProject::TextFormatting::Formats
         child = POSIX::Spawn::Child.new(PandocDownloader.pandoc_path, *command, input: stdin_data, timeout: timeout)
         raise child.err unless child.status.success?
 
-        child.out
+        # posix-spawn forces binary output, however pandoc
+        # only works with UTF-8
+        child.out.force_encoding('UTF-8')
       rescue POSIX::Spawn::TimeoutExceeded => e
         raise Timeout::Error, "Timeout occurred while running pandoc: #{e.message}"
       end

lib/open_project/text_formatting/formats/markdown/textile_converter.rb

@@ -168,7 +168,6 @@ module OpenProject::TextFormatting::Formats
         if markdowns_in_groups.length != orig_values.length
           # Error handling: Some textile seems to be misformed e.g. <pre>something</pre (without closing >).
           # In such cases, handle texts individually to avoid the error affecting other texts
-          logger.warn "Mismatch detected in conversion result. Retrying all items individually one time."
           progress = ProgressBar.create(title: "Converting items individually due to pandoc mismatch", total: orig_values.length)
           markdowns = old_values.map do |old_value|
             res = convert_textile_to_markdown(old_value, raise_on_timeout: false)