CONTEXT: Within a container, delete a block which has a sibling. The actual behaviour is to select the container after deletion. The goal of this commit is to select the previous sibling (if exists), or next one. Otherwise the parent element will be selected (default behaviour). task-2431506 closes odoo/odoo#64875 Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>