content filters and page slugs

[Carlos]

The content filter is available to filter the content of pages and replace parts or do some other processing.
If a plugin wants to replace the page content completely, it should rather do this in index-pretemplate:
...

I've found that if you use index-pretemplate instead of the content filter to replace a page's content, the $content variable must be prepared (encoded, slashed) so that GS can process it properly -- if not, a page having &lt; in the body will be broken or not rendered as expected, as it is decoded to <

Would this be the correct way to fix this?

Code:

$content = addslashes(htmlspecialchars($content, ENT_NOQUOTES, 'UTF-8'));

BTW @shawn_a - GS Blog seems to have this problem.