Re-ordering (moving) a sub-task one step up or down causes a full page refresh

Summary

• When re-ordering a sub-tasks one step up or down, this causes the full page to refresh.
• This issue was not occurring in JIRA 6.4.5 , but it started occurring only after upgrading to JIRA 7.

Steps to Reproduce

1. Install JIRA 7
2. Create an issue
3. Create many sub-task
4. Re-order the sub-task ( move the subtask up and down )
   

Expected Results

• The sub-task should be able to be moved without the whole page refreshing as it works well in JIRA 6.4.5

Actual Results

• The whole page is refresh resulting in the user needing to scroll back to where they were before. It refreshes with every Move button push which makes re-organizing sub-tasks too cumbersome to ever do.

Notes

• This issue is related to JRA-33647 Allow reordering of sub-tasks with drag & drop and without having to reload the page but that ticket did not give enough information and has been closed as duplicate to JRA-24547 Drag and Drop Subtasks which i believe is entirely different to what is reported in this bug ticket as this issue was not occurring in older versions of JIRA. That ticket is also created as a suggestion and i believe this issue a bug.