Tiered prices aren't updated if the quantity of an item is changed after the item has been added to the cart

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.0.7
• Fix Version/s: 2.1.0, 2.1.1
• Component/s: Shopping Experience
• Labels: None
• Git Pull Request: https://github.com/marco-leo/liferay-portal-ee/pull/666
• Epic Link: Advanced Pricing Strategies 1/3

Steps to Reproduce
I have a product with tier pricing as follows:

Quantity	Unit Price
1 - 99	$100
100+	$75

If I add 1 (or any amount below 100) of this product and check the cart, it shows the correct $100 unit price.
If I increase the count directly in the cart view to 100 or more, it still shows the unit price at $100 when it should be $75.
Likewise, if I start by adding 100 of the item to the cart, it shows the correct $75 unit price. If I drop the quantity below 100, it does not update the unit price back up to $100.

Notes

• Upon refreshing the cart page (e.g. F5), it shows the correct unit price.
• Proceeding with checkout does as well.

Reported via Slack by Brian Greenwald: https://liferay.slack.com/archives/CU1EBB058/p1582582780041000