Resend a TODO for each time an approval is required on a merge request

Summary

When 'Reset approvals on push' is enabled, a new TODO is not sent out when approvals are removed by a push. The TODO appears for each approver when a merge request is created and is automatically cleared for each approver upon the first time he/she approves it, but does not receive a TODO again. This may be considered more of a feature request, but I consider a mismatch between expected behavior based on documentation and actual behavior to be a bug.

Steps to reproduce

1. Enable 'Reset approvals on push'
2. Approve a merge request
3. push another commit onto the merge request

What is the current bug behavior?

No new TODO appears after a merge request has been approved once.

What is the expected correct behavior?

A TODO appears for each time an approval is required instead of only the first time.

Results of GitLab environment info

$ sudo gitlab-rake gitlab:env:info
WARNING: The GitLab Enterprise Edition license will expire on 2017-07-01.
System information
System:         Ubuntu 16.04
Proxy:          no
Current User:   git
Using RVM:      no
Ruby Version:   2.3.3p222
Gem Version:    2.6.6
Bundler Version:1.13.7
Rake Version:   10.5.0
Redis Version:  3.2.5
Git Version:    2.11.1
Sidekiq Version:5.0.0
GitLab information
Version:        9.2.2-ee
Revision:       b004167
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     postgresql
DB Version:     9.6.1
URL:            https://gitlab.gainesville.infiniteenergy.com
HTTP Clone URL: https://gitlab.gainesville.infiniteenergy.com/some-group/some-project.git
SSH Clone URL:  git@gitlab.gainesville.infiniteenergy.com:some-group/some-project.git
Elasticsearch:  no
Geo:            no
Using LDAP:     yes
Using Omniauth: no
GitLab Shell
Version:        5.0.4
Repository storage paths:
- default:      /var/opt/gitlab/git-data/repositories
Hooks:          /opt/gitlab/embedded/service/gitlab-shell/hooks
Git:            /opt/gitlab/embedded/bin/git