HTML entities showing in page title when using callback tab type

Title is actually Something & Something not Something & Something. The extra amp; is breaking the title.

The title actually is showing "Something & Something" with an extra amp;

Added code tags to show Something & Something with the extra amp;

Maybe an issue for core. The checkplain($text) function in bootstrap.inc returns htmlspecialchars without the fourth parameter for double_encode which defaults to true. For every tab drupal_get_title and drupal_set_title is called (plugins/QuickCallbackContent.inc line 64 and 67) for the same title and because the double_encode defaults to true the & in for example & is encoded again as &.

Solution:

1. Call drupal_get_title and drupal_set_title only once in plugins/QuickCallbackContent.inc in the render function

or

2. Add the 4th parameter to htmlspecialchars in check_plain of FALSE to prevent double encoding.

I tried posting here http://drupal.org/node/1630468 about check_plain() and didn't get any where.

A fix might be to simply use the PASS_THROUGH in drupal_set_title($page_title, PASS_THROUGH) skipping check_plain. This should be fine since the page title still gets run through check_plain at least once.

Here's a patch that adds PASS_THROUGH.

Setting as needs review.