TYPO3 Core

I am currently upgrading an old TYPO3 4.5 installation to 7.6 LTS and noticed a wrong behaviour in the indexed_search extension. In ticket #51189 and #61982 was a change made to remove the link parameter for the normal search if the advanced search mode is active. The problem with this change is, it does not consider the possibility that the advanced search is active by default ( activated by _DEFAULT_PI_VARS.ext=1 in TypoScript ). In that case, the link back to normal mode does not get the necessary parameter so switching backing to normal mode with the link in the marker ###LINKTOOTHERMODE### is simply not possible.

Since there are no hook or other TypoScript options available, my only chance is to use an xclass or change the core file.

It would be nice if there are some more options to create the correct link or revert the previous change. The argument in #51189 about duplicate content is no argument in my opinion because you can use a canonical url or use noindex,nofollow on the search page.

The problem occurs in 6.2 and most likey in 8 as well.