Earlier quoted context omitted.
Can I ask why it's considered "ugly" now but wasn't before? Isn't it just a few pixels bigger?
No, it is smaller so that is not the issue. The old completions used to use up the full width of the browser window. I can't exactly put my finger on it, but I suspect that the proportions are just slightly off.
No other input field becomes fat when you click on it. It is enough to just highlight the edges like the old version (And like every other input field) when you want to indicate that the input field is currently active.