Point of Sale - Global Discount in Line

This module extends the Point of Sale discount feature. In the Point of Sale settings, a new checkbox called "Add Discount in Line" appears next to the existing discount options. When you turn it on, the fields for choosing a discount product and a default discount percentage become hidden, because they are no longer needed.

At the Point of Sale screen, the discount button still asks for a percentage. If the new setting is active, that percentage is applied directly to every line of the current order as a line discount, and no discount product is added. If the setting is off, the original behaviour of the discount module is kept.

The module touches the pos.config model (where the setting is stored) and the res.config.settings model (where the checkbox is shown). It also changes the Point of Sale user interface through a JavaScript component that replaces the standard discount button behaviour. No new menus or reports are added.