Display Commit multiple lines in MRs using the available full width of the container

Summary

If the commit has multiple lines, when viewing the MR per commit, the expanded information is shown within a container that doesn't occupy the full width of the parent box, showing horizontal scrollbar sooner than necessary.

Steps to reproduce

1. Push a commit with multiple lines into an MR.
2. Go the Commits tab of that MR, click that Commit.
3. Resize the browser to a narrow width
4. see the scrollbar before it is necessary.

Example Project

gitlab-workhorse!549 (f5d5a1b2)

What is the current bug behavior?

Whitespace not being used to display the commit info.

What is the expected correct behavior?

Occupy the whitespace to make the container as wide as possible, to avoid the scrollbar.