Broken facet URLs in breadcrumb links when facet alias contains punctuation

Hi,

I like the breadcrumb trail feature based on active facets. Problem is the URL encoding can lead to broken links. For example, I have an entity with a field called "Category" and is a taxonomy term reference. Indexing this field with Search API gives facet links like:

/search?f[0]=category%3Aname:Apple

The facet is actually category:name, but must be written with a filter in the URL like: category%3Aname:Apple

The breadcrumb code in url_processor_standard.inc does not take this into account. It gives URLs like:

/search?f[0]=category%3Aname%3AApple

...which breaks the filter (it does nothing). So the difficult step comes down to this line 87 in setBreadcrumb()_

$query[$this->filterKey][] = $item['field alias'] . ':' . $item['value'];

In my case the field alias is 'category:name' which ends up correctly as 'category%3Aname', but the ':' is incorrectly jumbled up as well in the l() function, so the link does not work.