the input content was hided by the keyboard when rotate the device to landscape mode

[Relly]

system-image-cli -i
current build number: 109
device name: arale
channel: ubuntu-touch/rc-proposed/meizu.en
last update: 2015-09-10 12:41:21
version version: 109
version ubuntu: 20150910
version device: 20150818-0b38025
version custom: 20150814-887-8-46

reproduce steps:
1.rotate the device to landscape mode
2.launch Tasks app
3.create a task title
4.input some word to ""Add a tag""
5.you will see what you input is hided by the keyboard
expect result:
the input content should be display up the keyboard
actual result:
the input content was hided by the keyboard,we can not see what we input by the keyboard