TXT input Paragraph Style: single function failed

[horngping9]

   System:
   Win10 64bit, install calibre-ebook 64bit version

   Case :Convert TXT (with markdown style)to Epub
    When I set "Paragraph Style: single" in TXT input parameter dialog window,
    last ok version is v5.39.0 , but after 5.39.1, this function failed.

    When failed,the output epub has the same result as Paragraph Style: block
    all lines in a chapter will merge in to a singe line.

     ex: input TXT with markdown:

     ## chapter
         line1.
         line2.

     when fail since 5.39.1 epub output:
      chapter
            line1.line2.

      before 5.39.0 ok version epub output:
       chapter
             line1.
             line2.

[horngping9 (horngping9)]

Conversion options changed from defaults:
  dehyphenate: False
  cover: 'e:\\TEMP\\calibre_d0kaco54\\_7c05ir7.jpeg'
  verbose: 2
  chapter: None
  paragraph_type: 'single'
  formatting_type: 'markdown'
  level1_toc: '//h:h1'
  output_profile: 'kindle_pw3'
  level2_toc: '//h:h2'
  italicize_common_cases: False
  read_metadata_from_opf: 'e:\\TEMP\\calibre_d0kaco54\\qrl111wr.opf'
  markdown_extensions: 'toc'
  change_justification: 'justify'
  txt_in_remove_indents: True
  remove_paragraph_spacing: True
  use_auto_toc: True
  disable_font_rescaling: True
  dont_split_on_page_breaks: True
  remove_paragraph_spacing_indent_size: 2.0
  unwrap_lines: False
  insert_blank_line: True
  format_scene_breaks: False
  toc_title: '目錄'
  remove_fake_margins: False
Resolved conversion options
calibre version: 5.39.0
{'asciiize': False,
 'author_sort': None,
 'authors': None,
 'base_font_size': 0.0,
 'book_producer': None,
 'change_justification': 'justify',
 'chapter': None,
 'chapter_mark': 'pagebreak',
 'comments': None,
 'cover': 'e:\\TEMP\\calibre_d0kaco54\\_7c05ir7.jpeg',
 'debug_pipeline': None,
 'dehyphenate': False,
 'delete_blank_paragraphs': True,
 'disable_font_rescaling': True,
 'dont_split_on_page_breaks': True,
 'duplicate_links_in_toc': False,
 'embed_all_fonts': False,
 'embed_font_family': None,
 'enable_heuristics': False,
 'epub_flatten': False,
 'epub_inline_toc': False,
 'epub_toc_at_end': False,
 'epub_version': '2',
 'expand_css': False,
 'extra_css': None,
 'extract_to': None,
 'filter_css': '',
 'fix_indents': True,
 'flow_size': 260,
 'font_size_mapping': None,
 'format_scene_breaks': False,
 'formatting_type': 'markdown',
 'html_unwrap_factor': 0.4,
 'input_encoding': None,
 'input_profile': <calibre.customize.profiles.InputProfile object at 0x0000021B3E439D30>,
 'insert_blank_line': True,
 'insert_blank_line_size': 0.5,
 'insert_metadata': False,
 'isbn': None,
 'italicize_common_cases': False,
 'keep_ligatures': False,
 'language': None,
 'level1_toc': '//h:h1',
 'level2_toc': '//h:h2',
 'level3_toc': None,
 'line_height': 0.0,
 'linearize_tables': False,
 'margin_bottom': 5.0,
 'margin_left': 5.0,
 'margin_right': 5.0,
 'margin_top': 5.0,
 'markdown_extensions': 'toc',
 'markup_chapter_headings': True,
 'max_toc_links': 50,
 'minimum_line_height': 120.0,
 'no_chapters_in_toc': False,
 'no_default_epub_cover': False,
 'no_inline_navbars': False,
 'no_svg_cover': False,
 'output_profile': <calibre.customize.profiles.KindlePaperWhite3Output object at 0x0000021B3E455370>,
 'page_breaks_before': "//*[name()='h1' or name()='h2']",
 'paragraph_type': 'single',
 'prefer_metadata_cover': False,
 'preserve_cover_aspect_ratio': False,
 'preserve_spaces': False,
 'pretty_print': True,
 'pubdate': None,
 'publisher': None,
 'rating': None,
 'read_metadata_from_opf': 'e:\\TEMP\\calibre_d0kaco54\\qrl111wr.opf',
 'remove_fake_margins': False,
 'remove_first_image': False,
 'remove_paragraph_spacing': True,
 'remove_paragraph_spacing_indent_size': 2.0,
 'renumber_headings': True,
 'replace_scene_breaks': '',
 'search_replace': '[]',
 'series': None,
 'series_index': None,
 'smarten_punctuation': False,
 'sr1_replace': None,
 'sr1_search': None,
...

[Kovid Goyal (kovid)]

Your lines are indented so the markdown processor considers them to be a
block quote. Unindent your lines and you will be fine. AKA use

## chapter 1
line1
line2

 status invalid

[horngping9 (horngping9)]

I have set parameter: txt_in_remove_indents: True
That is ok before 5.39.0,but fail after 5.39.1

Retest with remove indent of lines,it still have the same fail result.

[Kovid Goyal (kovid)]

Works for me with

ebook-convert t.txt t.epub -dp --txt-in-remove-indents --paragraph-type=single

and your sample text in t.txt

[horngping9 (horngping9)]

test cmd: ebook-convert t.txt t.epub -dp --txt-in-remove-indents --paragraph-type=single
it can do valid paragraph process , so there has parameters conflict with --paragraph-type=single .
My convert parameter had list on second comment. I used the parameters set for long time, until 5.39.1 faild.
Is there any parameter I misuse?

[Kovid Goyal (kovid)]

Go through the list and figure out what is causing the issue.

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every alternate Friday.

 status fixreleased

[horngping9 (horngping9)]

After tested every parameter I found that check ther TXT Input dialog : "Remove indents at the beginning of lines" cause convert paragraph invalid. Uncheck it will convert valid paragraph