A few small nits on the description:

Typo: "Currenltly" -> "Currently"
Descriptions should wrap to about 75 characters, which helps them fit properly in Git commit messages. Often, the editor used to create commit messages will wrap at the necessary point (though it depends on your environment), so we recommend drafting the description there.
Rather than linking to the issue in the description, put the bug number in the "Bugs" field on the right.

Can you add two screenshots, one showing the way that it looked before, and one showing how it looks now with the fix in place?

Unit tests wouldn't test this sort of thing, so it's probably not worth mentioning the test suite here. Instead, I'd like to see more about the manual tests you performed, with enough instruction to let us reproduce the problems and the solutions for when we go to land this.

It doesn't seem this is really fixed. It's more broken in a different way. By applying the overflow rule, we're telling the browser to chop off anything that's too wide, but the problem is that it's getting to be too wide in the first place.
In other words, we're attempting to address the symptom without addressing the core problem.
I think you'll want to jump back in and investigate that core problem, which is that long text within each entry doesn't wrap. For that, you might want to look at white-space: pre-wrap, which is like <pre>'s default whitespace-preserving behavior (which this will use, being in a <pre>, but with wrapping.