When the user clicks the checkbox to add a warehouse, the field next to it is invisible, making it difficult to notice. This commit highlights the field and adds a placeholder to make it obvious. task-3486780 closes odoo/odoo#139528 X-original-commit: a60c94203072fd2343f6ca3a33a2cc1813757bea Signed-off-by: Bouvy Damien (dbo) <dbo@odoo.com>