Issue Summary

The editor doesn't work with Japanese IME.

Steps to Reproduce

1. Activate the IME by switching the input language
2. Set the IME mode to Full-width(全角)
3. Type "tesuto"(てすと)
4. Hit enter key to determine the character
5. Hit enter key to start a new line
6. Hit the del key to remove the characters in Step.4

Repeat steps 4 ~ 6, and sometimes the issue occurs.

Expected Results

"てすと" is entered

Actual Results

"えすとt" is entered

Workaround

Set the WYSIWYG editing to OFF from https://trello.com/u/me/labs