Roadmap Planner doesn't work well with IMEs

Issue Summary

When a user edits Roadmap Planner with IME, typing enter (return key) to select a candidate from the IME, which unexpectedly exits editing mode. It can occur to most CJK users.

Steps to Reproduce

Assuming you're going to type 日本語の文章:

1. Enable IME
2. First type a Japanese string: にほんご
3. Then try to convert にほんご to 日本語 by using the IME function
4. When you press down the enter key to select 日本語, the focus exits from the input area
5. To input the following characters, you need to select the edit button once again

Expected Results

After you pressed down enter (return key) to select a candidate from the IME, the focus remains in the input area, and the editor is available.

Actual Results

After you pressed down enter (return key) to select a candidate from the IME, the editor exits from the input area.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available