fix: fix checkbox not work as expected in html module.

[penkzhou]

First, let me describe how the bug was discovered. I was using this lib to export Markdown to PDF. The library first renders the Markdown in an editor on the page by calling the markdownToDocument method. It then converts the rendered document to HTML code via the documentToHtml method. Finally, it exports the generated HTML into a PDF file.

To visualize the steps, here are some screenshots:

editor ui	bug export to pdf	normal export to pdf

bug cause

according the MDN docs, checkbox should write like this:

checked checkbox

<input type="checkbox" id="scales" name="scales" checked /> <label for="scales">Scales</label>

non check checkbox(without checked attribute)

<input type="checkbox" id="scales" name="scales" /> <label for="scales">Scales</label>

how to fix it

change the code in the todo_list_node_parser.dart file. main change include following points:

1. change the insert position of input tag to keep checkbox in the first of the line.
2. change the way of setting checkbox's checked attribute.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e80edfc) 75.50% compared to head (7f7335a) 75.50%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #700   +/-   ##
=======================================
  Coverage   75.50%   75.50%           
=======================================
  Files         296      296           
  Lines       13630    13630           
=======================================
  Hits        10291    10291           
  Misses       3339     3339           

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[LucasXu0]

LGTM.