Parsing issue with \note

[tlienart]

\newcommand{\note}[1]{@@note @@title ⚠ Note@@ @@content #1 @@ @@}

\note{This assumes that you're working on a user folder with final URL looking like 
`username.github.io`. See [this example](https://github.com/tlienart2/tlienart2.github.io) for 
instance.}

[tlienart]

A bit of a shitty one to debug...

Here's a MWE

julia> s = read("index.md", String)
"\\newcommand{\\note}[1]{@@note @@title Note@@ @@content #1 @@ @@}\n\n\\note{A `B` C}\n\nD\n"

julia> s |> fd2html
"<div class=\"note\"><div class=\"title\">Note</div> <div class=\"content\">A <code>B</code> C</div></div><code>B</code> C&#125;</p>\n<p>D"

Shortened

s = "\\newcommand{\\note}[1]{#1} \\note{A `B` C} D" |> fd2html

--> issue with a code block inside a latex command.

[tlienart]

Ok so turns out this is a bit of a nasty one, due to the PR introducing double brace blocks there's now a two-part search for ocblocks, each one checks whether outer blocks contain "inner" blocks but independently of each other. So what happens is:

• first search finds code block
• second search finds LXB but doesn't check the first blocks
• both are still active --> double insertion

this is easy to fix by extracting the "look for inner" part into something that's done on the vcat of blocks. fix pending

I'll also add a batch of tests with nesting of latex-like commands, that stuff should be rock solid.