Code blocks placed on single line without language

[TomGillen]

If I use either CodeSnippets or manually write the markdown for a multi-line code block (fenced or indented), when viewing the text as markdown, the plugin removes all line breaks and forgets which language was being used.

e.g.

```c#
bool Foo()
{
    return false;
}

becomes:

bool Foo(){    return false;}

This in turn removes all syntax highlighting and formatting when switching back to WYSIWYG.

[tablatronix]

I have the some problem with pre elements all newlines are removed...

[tablatronix]

also fails to load code block languages in

<code class="language-php">

is lost, but if iI do a ```php it puts it back in, so the html read in is not parsing it.