Since [1] when device visibility became a visibility option, when dropping a snippet that contains device-invisible blocks, all those blocks were made visible. This commit makes that behavior limited to blocks that are not device-invisible. (E.g. when dropping a popup) Steps to reproduce: - drop a Columns snippet - hide a column on mobile - hide a column on desktop - save snippet - drop saved snippet in either desktop or mobile preview => All columns were shown with the `o_snippet_override_invisible` effect on the conditional ones. [1]: https://github.com/odoo/odoo/commit/3103e0553011b5c1f4078972d7a88fa3fd4068b2 task-3538535 closes odoo/odoo#140505 Signed-off-by: Arthur Detroux (ard) <ard@odoo.com>