Titles of RSS feeds lacks spacing - words are run together

[DavidAnderson]

Line 24 of wp-includes/feed-rss2.php has:

<title><?php bloginfo_rss('name'); wp_title_rss(); ?></title>

There's no space between those two parts. In my (development) site, for the feed for a category "News" (which is the main one I'm offering up), that results in:

<title>SitenameNews</title>

[SergeyBiryukov]

Related: #21366

[DavidAnderson]

Issue still present in WordPress 3.9.1.

[SergeyBiryukov]

Could not reproduce with default themes.

get_wp_title_rss() has » as a default separator: tags/3.9.1/src/wp-includes/feed.php#L91​.

This is the same issue as in #21366. It only happens if the theme has a custom function attached to wp_title, and that function doesn't include an is_feed() check (as in [21276]). The fix for the theme would be like [21327].

If #21366 is not an option due to backwards compatibility issues, we could probably enforce the separator in get_wp_title_rss() if the filtered title doesn't start with a space. 22362.patch​ does that.

[SergeyBiryukov]

In 28921:

Force a separator in get_wp_title_rss() if it was inadvertently filtered out by the theme.

fixes #22362.