forked from CGM_Public/pretix_original
a6c72abe75
* Change semantics of changing orders This basically does two things to the "Change products" view of orders and the OrderChangeManager program API: 1) It decouples changing items or subevents from changing prices. OrderChangeManager.change_item() and .change_subevent() no longer touch the price of a position. Instead .change_price() needs to be called explicitly. However, a client-side JavaScript component now *proposes* a new price based on the changed item or subevent. 2) The user interface now exposes the possibility of doing multiple things at the same time, i.e. changing the item, subevent and price in the same operation. OrderChangeManager already allowed this before. (1) is basically a consequence of (2), while (2) is a prerequesite for e.g. the `seating` branch, where changing the subevent will always require changing the seat. * Add tests for price calculation API