Auto expand textarea while typing a message

[satyamtg]

I'm submitting a ... (check one with "x")

• bug report
• feature request
• support request => Please do not submit support requests here, instead ask your query in our Gitter channel

Current behavior:
Currently, the textarea has fixed width and height due to which a scrollbar comes if the message is long enough. This makes the message difficult to read and review before posting it.

Expected behavior:
The solution would be to change the height of the textarea dynamically so that messages that are long are easier to read.

Steps to reproduce:
Just type a long enough message in the textarea provided.

Would you like to work on the issue?
Yes