Bug 1043518: Add explicit "min-width:0" to flex items in SMS app, for recipient, compose, & message-body fields, so long user input doesn't blow up those elements. r=azasypkin
Merge pull request #22127 from dholbert/1043518

Bug 1043518 - Typing a long message or contact-name in SMS app will push the "send" / "add contact" buttons offscreen