Cart Price Rules: Filterable Action Dispatcher

[solverat]

Q	A
Bug report?	no
Feature request?	yes
BC Break report?	no
RFC?	no

In some cases, the ecommerce manager wants to apply rule actions on specific cart items only. Examples:

Example I

• Voucher rule exists (-50%)
• => Only apply action (-50%) on cart items without reduced prices (without applied specific price rules)

Example II

• Cart rule exists (-50% if cart > 1.000,-
• => Only apply action (-50%) on cart items without reduced prices (without applied specific price rules)

Proposal: Adding a isApplyableForRule filter event in cart rule process could be a solution. Don't know if there could be a priority issue, though (Not resolved items at this very moment, for example). This could be related to https://github.com/coreshop/CoreShop/issues/1729