Change isolation link unit tests to cover both deleteBackward methods : - deleteBackward via direct contenteditable command - deletebackward via input event ( mobile ) task-3054245 closes odoo/odoo#105066 X-original-commit: 123051fc8b61e27fc8e39f0fed02a58186fca7e3 Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>