Ordered lists do not respect `start` attribute

[ara4n]

Steps to reproduce

1. Send a message like: "2. works for me"
2. You see "1. works for me"
3. Everyone else sees "2. works for me"
4. Check the HTML, and it has:

<ol start="2">
<li>works for me</li>
</ol>

Realise that EXA is ignoring the start attribute on the ol tag.

EXI gets it right, as does EW.

Application version and app store

Whatever @kongo09 is on

[jmartinesp]

Looks like a duplicate of https://github.com/element-hq/element-x-android/issues/1522, which we de-prioritised.

[ara4n]

why would we de-prioritise this?

[jmartinesp]

It needs several changes in the rich text editor libraries at different levels (HTML parsing, the DOM model, the generated MD/HTML, Android, iOS, web) and it didn't seem like something that's used very often.

[bmarty]

Thanks Jorge for the fix. For posterity, there is still and issue (originally commented here), if the user types:

2. Line 1
4. Line 2

The result will not be what's the user has entered, but something like

2. Line 1
3. Line 2

Element Web and GitHub are also impacted by this issue, which should occur way less often hopefully.