Bug: when writing in RTL mode, lists with more than 9 items missing a space

[amitm02]

Steps for Reproduction

1. Set write direction to RTL
2. Enter a numbered list with more than 9 items

Expected behavior:

The content of each item in the list will have separated from the item index.

Actual behavior:

Starting with item index 10, there is no separation between the content of the item and the item index. Bug appears in either english or Hebrew fonts.
english fonts img
hebrew fonts img

Platforms:
OSx, Chrome v58.
Include browser, operating system and respective versions

Version:
[email protected]'.

[benbro]

The RTL style should be the opposite of the LTR style.
https://github.com/quilljs/quill/blob/master/assets/core.styl#L76
This style:

li::before
    display: inline-block
    margin-right: LIST_STYLE_MARGIN
    text-align: right
    white-space: nowrap
    width: LIST_STYLE_WIDTH
li:not(.ql-direction-rtl)::before
    margin-left: -1*LIST_STYLE_OUTER_WIDTH

Should probably changed to something like:

li::before
    display: inline-block
    white-space: nowrap
    width: LIST_STYLE_WIDTH
    margin-right: LIST_STYLE_MARGIN
    margin-left: -1*LIST_STYLE_OUTER_WIDTH
    text-align: right
li.ql-direction-rtl::before
    margin-left: LIST_STYLE_MARGIN
    margin-right: -1*LIST_STYLE_OUTER_WIDTH
    text-align: left

I'll test it locally and create a PR.