Feature: Percentage discount on lists

[gingemarsson]

Add percent discount to equipment lists. The percentage discount is applied to each row to get a value in kronor, which is added to the row-specific discount.

I am marking this as a draft since I want feedback and ideas on how to communicate these discounts clearly to the user and to the customer, as these now are quite a few factors affecting the price (base price, number of days, row discount and list discount). For now, I have only done the bare minimum in terms of communicating the discount:

• Showing the percentage discount with the list header (both document and stage)
• Include de percentage discount in the shown discount (both document and stage)
• In the Advanced Editing view, show the percentage discount below the row discount field.

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In the following screenshots the top row have a manual discount of the full price (i.e. I used the "Sätt rabatt till 100%" feature), the second row have a manual price of 0 (i.e. I used the "Sätt anpassat pris till 0" feature), the third row have manual discount of 32 kr ex moms (40 kr inc moms), and finally the last row are a "normal row" with a simple price and no manual discount applied.

In particular, I want feedback on what to show in the discount information popover, as it currently only shows the total. We could split the discount into percentage/list and manual/row, but it was har to label these values in a clear and concise way. To further complicate things, the maximum discount is the full price (since rows cannot have a negative sum) so if the sum of the discounts is to large we need to reduce it which also might be hard to communicate in a clear way.

[m4reko]

Wouldn't it be reasonable to always apply the list discount after the entry discount? That would somewhat solve the problem of the two discounts adding up to more than the price. The behavior would be very similair to how it works today for entry discounts only adding another percentage discount after it which of course never go below 0.