Description of Problem:

When many recipients are added to a message, the entry box becomes cumbersome.

Steps to reproduce the problem:
1. Enter many addresses into the To: or Cc: field of a composer window.

Actual Results:

The text entry box remains only a single line high, and manual cursor
movement is required to navigate it. No scrollbar is observed.

Expected Results:
The text entry box should grow to a suitable maximum of perhaps five lines,
and should have a vertical scrollbar if further expansion is required.

How often does this happen? 


Additional Information: