Filters are not escaped

[NightJar]

silverstripe-fulltextsearch/src/Solr/SolrIndex.php

Lines 1044 to 1047 in 6c59fcf

	$components = array_merge(
	$this->getRequireFiltersComponent($searchQuery),
	$this->getExcludeFiltersComponent($searchQuery)
	);

Filters added to a search query are not sanitised
Exclusions added to a search query are sanitised

This is confusing and not a good experience, as a developer must escape some classnames and no others when consuming the API to perform a search.

[emteknetnz]

This should be fairly easy,

    public function sanitiseClassName($className, $replaceWith = '\\\\')
    {
        return str_replace('\\', $replaceWith, $className);
    }

Update this to detect if there's any double escaping about to happen i.e. strpos($str, '\\\\') !== false , to prevent break existing sites that are adding ->sanitiseClassName in their custom code e.g. #247 (comment)

Then just add $this->sanitiseClassName() to getRequireFiltersComponent()

Remember to include unit tests

[dhensby]

This is a duplicate of #247