Unable to modify squash commit message for fast-forward only merge method
When Merge method
is selected to Fast-forward merge
the Modify commit message
button disappears from a merge request:
![scc46](data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==)
Thus makes impossible to make custom squash commit messages.