The PM recipient input field doesn't utilize the max width of the text box

[rishabh]

This is a tiny UX issue but it can get quite annoying when you want to send e-mails to moderately long e-mail addresses from Discourse. The full address doesn’t remain in view after 170px.

[sam (Sam Saffron)]

This control is rather fiddly, perhaps @awesomerobot or @Johani can have a look, I am not sure this is a starter task.

[awesomerobot (Kris)]

I made a minor update here that will give that input a little more flexibility.

https://github.com/discourse/discourse/commit/62ebfbbb67f75d6e09955f5ef56f2abd62fd6da5