Set expand-region-smart-cursor to nil before expansion

[SpringerJack]

If expand-region-smart-cursor is set to t the point may end up at the end of the region. In that case embrace--expand-region-research will fail to identify the matching pair leading to the use of embrace--fallback-re-search. This leads to unexpected behaviour e.g. when deleting a pair of parentheses:

(defun example () | nil) => (defun example ) | nil