Topic on Extension talk:Linter

Tracked in task T183379 -- Fixed and deployed.

Steps to reproduce:

Paste the following wikitext in a page or simply use the parsermigration-edit , and click preview:

 <i> <b>foo<b>k
<b>foo</i>

Output:

[WjpdFQpAICkAAKBp10gAAAAY] 2017-12-20 12:52:37: Fatal exception of type "RemexHtml\TreeBuilder\TreeBuilderError"

Note the space behind the <i> . That's a pre block, it also seems to happen with a div and perhaps other tags.