In order to pass the validation of the snailmail provider, the margins are required to have nothing but white pixels. To avoid letters being stuck until their layout is fixed, we fill the margins with white. closes odoo/odoo#107180 X-original-commit: 206eb42468997d23b9b998530d246aa0bc69607d Signed-off-by: Florian Daloze (fda) <fda@odoo.com> Signed-off-by: Louis Baudoux (lba) <lba@odoo.com> Signed-off-by: Solan Delvenne (sode) <sode@odoo.com>