[Post edit] BBCode Is not retained when editing

[AkesiSeli]

Some elements of the original markup (e.g. headlines and quotations) are not retained when editing a post and must be re-inserted manually.

Even newlines under some circumstances appear to be lost.

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Source: report on Friendica

[AkesiSeli]

I've found the cause of this issue, with BBCode posts:

• the "source" I get from the backend with the GET v1/statuses/:id/source does not retain any markup so it cannot be used
• the post content has HTML syntax, which is not what users want

The only solution was to attempt to "reconstruct" the original BBCode from the HTML, client-side and by hand. Which is not ideal at all.

The current implementation was not completed and missed some cases, which have been added in #642. This is a tentative fix and should be improved and refined further, though.