Keyboard issues

Related: https://github.com/badoo/Chatto/pull/115

B)
1. Go to a chat conversation
2. Tap on textfield to open keyboard
3. Press return multiple times (until the textfield grows enough to show scroll indicators, and touches the navigation bar)
4. Keep pressing return
iOS 9: Cursor jumps slightly

E)
1. Go to a chat conversation
2. Tap on textfield to open keyboard
3. Paste very long text (so textfield grows enough to show scroll indicators, and touches the navigation bar)
3. Open Chinese (Traditional) - Zhuyin keyboard
4. Open full-screen chinese keyboard ( tap on ^ )
5. Drag the keyboard down by swiping down

Full-screen chinese keyboard will be misplaced. It will be in the middle of the screen ( looks like as much as the textfield grows once it's placed at the bottom )

F)
1. Go to a chat conversation
2. Tap on textfield to open keyboard
3. Long press on a text message with a date
4. Choose "Create event" from action sheet
5. In the create event screen dismiss the keyboard
6. Cancel event creation

Input field is placed in the middle of the screen

Start by reproducing the keyboard scenarios in a chat conversation, including repeated returns, long pasted text with the Traditional Chinese keyboard, and cancelling event creation after dismissing the keyboard. Review the related pull request #115 and verify that the input field and full-screen keyboard return to their correct positions in each case.

Written by the indexing model from the issue text.