webui doesn't allow to select a custom commit id to compare
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Summary
Since I upgraded from gitlab 8.10.6 to 8.12.6 the compare section in the webui doesn't allow to select a custom commit id. Only a branch can be selected.
Steps to reproduce
go to project >> repository >> compare . The help message says "Fill input field with commit id like 4eedf23 or branch/tag name like master" but the input field only allows to select a branch
Expected behavior
The input fields should allow to select a custom commit id
Results of GitLab environment info
[root@git ~]# gitlab-rake gitlab:env:info
System information
System: CentOS 6.6
Current User: git
Using RVM: no
Ruby Version: 2.3.1p112
Gem Version: 2.6.6
Bundler Version:1.13.2
Rake Version: 10.5.0
Sidekiq Version:4.1.4
GitLab information
Version: 8.12.6
Revision: fa20b51
Directory: /opt/gitlab/embedded/service/gitlab-rails
DB Adapter: postgresql
URL: https://domain.com
HTTP Clone URL: https://domain.com/some-group/some-project.git
SSH Clone URL: ssh://git@domain.com:2222/some-group/some-project.git
Using LDAP: yes
Using Omniauth: no
GitLab Shell
Version: 3.6.1
Repository storage paths:
- default: /var/opt/gitlab/git-data/repositories
Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks/
Git: /opt/gitlab/embedded/bin/git
You have new mail in /var/spool/mail/rootExtra notes
If I manually generate the url containing a commit id it works. e.g. https://domain.com/project/repository/compare?from=096b820dd6b14b7fc9d2c9eee6093447e69bb15d&to=branchName
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