@jrieken Closed the previous PR #52259 (made a small mess). This one has the algorithm implemented with the changes you suggested in the previous PR.

lgtm. thanks @bitshiftza

I did not manage to trigger getPreviewRangeBasedOnBrackets by using the PHP or TypeScript language server.
Since targetSelectionRange seems to be set always in my experiments, I assume getPreviewRangeBasedOnBrackets is no longer needed.

As there are no tests for this code and the code is hard to read and undocumented, I removed it in 1d7f844.

This helps me to refactor findNextBracket, as this piece of code no longer holds me hostage.

I'm sure the new bracket pair matching API would make this algorithm obsolete anyway.