The contents will be displayed under "To:field" when keyboard is revealed with too many lines entered

[Evan Wang]

$ system-image-cli -i
current build number: 104
device name: krillin
channel: ubuntu-touch/rc-proposed/bq-aquaris.en
last update: 2015-08-20 03:24:50
version version: 104
version ubuntu: 20150819
version device: 20150817-3879cb2
version custom: 20150814-887-30-30-vivid

Steps to reproduce:
1. Launch Messaging app
2. Rotate device to landscape mode
3. Swipe up from bottom to open a new message
4. Enter many text lines or add a photo in text filed

Expected results:
The contents should not be displayed under "To:field"

Actual results:
The contents will cross the boundary to be displayed under "To:field" when keyboard is revealed