Minor fix: the background grid is not observed in the first place, setting a z-index on it should not be observed either. Noticed when fixing `automaticStep(Un)active()` at [1]. [1]: https://github.com/odoo/odoo/commit/c2d952689c97add74a372c90aa18787094d5d93a Related to task-3576046 closes odoo/odoo#147970 X-original-commit: 901ed6d8c6c6bdb8aff8e9366d63bba59051019a Signed-off-by: Guillaume Dieleman (gdi) <gdi@odoo.com>