The commit odoo/odoo@babf7634e0 broke a previous fix in odoo/odoo@6228500a3f allowing the chatter to grow beyond its original size. This commit restores the `flex-grow: 1` on the chatter's container but also limit its maximum width (like in saas-15.3) to avoid it becoming unreadable. closes odoo/odoo#102767 X-original-commit: 3db27dc6c2e22b2b86650d1828f8e52929c43df6 Signed-off-by: Pierre Paridans (app) <app@odoo.com> Signed-off-by: Romain Estievenart (res) <res@odoo.com>