When a topic title includes an internal link, the title should render as a working link in the topic header.

This will use the edit summary parser.

Examples: 
The topic title is [[Foo]] -- it will render as Foo -- a link to the article page Foo.
The topic title is [[Foo|Bar]] -- it will render as Bar -- a link to the article page Foo.
~~The topic title is [http://foo.com Foo] -- it will render as Foo -- an external link to foo.com.~~ (We decided to use the edit summary parser, which does not support this.)

NOTE #1: For posts, replies and edits to a post/reply -- in watchlist, recent changes and contributions, there will be a blue link that says Foo -- but this will NOT be a link to the article page Foo. It will be a link to the Topic:UUID. See screenshots below. 

NOTE #2: In topic history, board history, watchlist, recent changes and contributions, when there is a change to the topic summary, or moderation actions, the topic title will be rendered as Foo, no link. 
For example: created topic summary on Foo

**Topic heading -- this should be a working link**
{F250640}

**Contributions** -- 
For the post/reply/edit, the link should render as the title (no brackets), and should link to the Topic:UUID, not to the page.
For editing the topic summary, the link should render as the title, not linked.

{F250665}

**Recent changes** --
For the post/reply/edit, the link should render as the title (no brackets), and should link to the Topic:UUID, not to the page.
For editing the topic summary, the link should render as the title, not linked.

{F250670}

**Watchlist** --
For the post/reply/edit, the link should render as the title (no brackets), and should link to the Topic:UUID, not to the page.
For editing the topic summary, the link should render as the title, not linked.

{F250675}

{F250677}

**Board and Topic history** --
For both post/reply/edit and editing the topic summary, the link should render as the title, not linked.

{F250682}

{F250686}

See {T115910}.

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previous version of the ticket: 

Flow: Wikitext formatting (such as [[links]] and ''italics'') doesn't work in topic titles

When you create a new Flow thread, there's a "topic" field. This topic field is analogous to the "subject" field in a wikitext talk page. The topic field currently cannot support wikitext.

Example: http://ee-flow.wmflabs.org/w/index.php?title=Sandbox&workflow=0509a3b2518b34dffb6efa163e68c4ac&action=view

Topic input: "here's a new [[topic]]"

Expected behavior: "[[topic]]" becomes an internal hyperlink

--------------------------
**Version**: unspecified
**Severity**: enhancement
**URL**: http://ee-flow.wmflabs.org/w/index.php?title=Sandbox&workflow=0509a3b2518b34dffb6efa163e68c4ac&action=view
**See Also**:
* {T23445}
* {T59950}
* Tech News posts to LQT pages converted to Flow: https://www.mediawiki.org/wiki/Topic:Siez4a3hsji86cay

https://trello.com/c/bj3IZSE5/190-limited-wikitext-formatting-in-topic-titles