Full Tax Summary display wrong numbers.

[heyqule]

The full tax summary is displaying total tax, instead of showing individual tax value.

Preconditions

1. Magento 2.1.8 and 2.2.0
2. PHP 7.0.22
3. MYSQL 5.6.35

Steps to reproduce

1. Set Display Full Tax Summary to Yes
2. Set up 2 tax rule to apply 2 taxes.
3. Create an order with 2 taxes. I create an order for BC Canada with GST 5% and PST 7%.
4. Go to order page and expand total tax summary

Expected result

1. GST and PST should have a different value.

Actual Result

1. GST and PST have a totaled value.

The Current Fix:

Magento 1 appearently used to has this issue as well. I ported the M1 fix to M2. The change worked.

See the following gist for detail in line 88.
https://gist.github.com/heyqule/7c830137715544ff95baba50a5ed3d80

[magento-engcom-team]

@heyqule, thank you for your report.
We've created internal ticket(s) MAGETWO-81574 to track progress on the issue.

[adrian-martinez-interactiv4]

@heyqule taken gist proposed solution for PR :D

[heyqule]

@adrian-martinez-interactiv4 Thanks for setting up the PR.