Remaining Estimate not updated with Split issue feature

Summary

When an issue is split, the remaining estimate of the issue is not adjusted to reflect the changes in the Original Estimate.

Steps to reproduce:

1. Set a Scrum board to use Original Estimate with Remaining Estimate as Estimate option.
2. Access the backlog and set an estimate of an issue to 2weeks (example). Both Original & Remaining Estimates will be 2w.
3. Right-click on the issue and click Split.
4. Set the name of the split issue and adjust the estimate of the issue (1w + 1w as an example).
5. Click save and check issue detail view of both issues. The remaining estimate of the original issue will remain at 2w. 

Environment

JIRA 7.5 and above. 

Expected Results

The Remaining Estimate is updated to reflect the changes with the Original Estimate

Possible solutions:

• Automatically adjust the remaining estimate
• Let the user input the remaining estimate during the split action

Actual Results

The Remaining Estimate is not updated to reflect the changes with the Original Estimate
 

Workaround

Manually edit the Remaining Estimate