cleanup-list-numbers doesn't work when there's leading space

[legends2k]

When there're leading spaces in a numbered lists' numbers, markdown-cleanup-list-numbers renumbers the items incorrectly.

Steps to Reproduce

Have a buffer in markdown-mode and the following text

Shortcuts
---------
  2. Horizontal rule: `C-c C-s -`
  3. Underlined header `C-c C-s !`
 10. Convert to HTML: `C-c C-c m`

Press C-c C-c n to reorder numbers.

Expected Output

  1. Horizontal rule: `C-c C-s -`
  2. Underlined header `C-c C-s !`
  3. Convert to HTML: `C-c C-c m`

Actual Output

Shortcuts
---------
  1. Horizontal rule: `C-c C-s -`
  2. Underlined header `C-c C-s !`
 1. Convert to HTML: `C-c C-c m`

Software Versions

• Markdown Mode: markdown-mode, version 2.4-dev
• Emacs: 26.2
• OS: Archlinux

[syohex]

Thanks for reporting issue. I have merged #459. Please check latest version.