TYPO3 Core

Typo3-installations with a apache-locked /typo3/ directory can't display
the indexed_search icons in the frontend. The icon path is generated by the
function getIcon (in class.external_parser.php):
...
return 'EXT:indexed_search/pi/res/'.$extension.'.gif'
...

Because indexed_search is installed in sysext, the result page of indexed_search
returns icon paths like this /typo3/sysext/indexed_search/pi/res/pages.gif
Which results in a 'image not found' if the backend is locked by apache or
in a http_auth login box if there is a http-auth configured for the typo3 backend.

Possible Solution:
Make this path configurable.

(issue imported from #M7206)