Allowing HTML in block title - where is $block->subject created? I want to get a &lt;br&gt; tag into a block-title but by default the brackets are turned into html characters. My theme's block.tpl is 

&lt;h2&lt;?php print $title_attributes; ?&gt;&gt;&lt;?php print $block-&gt;subject; ?&gt;&lt;/h2&gt;


so it looks like the rendering isn't happening there. I can't find where $block-&gt;subject is getting processed. It's not in my theme's template.php. So where in core is $block-&gt;subject assembled?
You may be interested in Block Class Styles, which has an additional feature:


  Allows the ability to set a global text format for custom block
  titles; this allows you to now have HTML in your custom block titles.
  Yes, you can now have block titles that contain HTML markup!