Redmine

Due to a rounding error at source:tags/4.1.1/app/models/issue.rb#L1717, a parent task may show 99% done even when all subtasks are 100% done.

irb(main):001:0> 1610 / 16.1
=> 99.99999999999999

Steps to reproduce:

1. Set "% Done" setting (Administration > Settings > Issue tracking) to "Calculated from subtasks"
2. Create a parent task.
3. Create a subtask 1 with 10.0 estimated hours and 100% done ratio
4. Create a subtask 2 with 6.1 estimated hours and 100% done ratio
5. Now the done ratio of the parent task shows 99% instead of 100%