Markdown Writer: Omit extra spaces at ordered lists

[marph91]

Related discussion: #11129

This is a follow-up of #7172, where this feature was discussed for unordered lists.

Current Behavior (Pandoc 3.8)

$ printf "1. 1\n   1. 1.1\n2. 2" | pandoc --from markdown --to markdown -
1.  1
    1.  1.1
2.  2

Suggested Behavior

Single digit - omit space

1. 1
   1. 1.1
2. 2

Two digits - keep space as before

1.  1
    1.  1.1
2.  2
3.  3
4.  4
5.  5
6.  6
7.  7
8.  8
9.  9
10. 10

Three or more digits

Probably, it should be aligned like:

1.   1
     1.  1.1
10.  10
100. 100

Not sure how often that long lists occur, though.

[jgm]

Notes:

1. we can't go beyond the 3-digit case, because then the contents may be interpreted as indented code blocks.

2. pandoc allows ordered lists with letters and with roman numerals, as well. With letters, there is the complication that we need two spaces after A. to prevent it from being interpreted as an initial. (This is a special rule documented in the manual.) So with capital-letter lists, we need the two spaces. We could use just one space for small-letter lists, but it might be odd to make a distinction like this.

3. Roman numerals can get quite long even with low numbers, e.g. viii. So for Roman numerals it probably makes sense to just do what we do now.

In short, the only case where it might make sense to behave differently is for a list with (a) decimal numbering, (b) only a following delimiter (i.e., not (1)), (c) maximum number < 10. I think this is why I just used a uniform size for all ordered lists. Open to feedback on this, though.