pre select inline style, then input in composition mode, the selected inlinestyle not work

[psybor]

Do you want to request a feature or report a bug?

IME mode bug

What is the current behavior?

just see the draftjs.org example

with some investigation，I console the editorState.toJS(), find out below:
after I select a inlinestyle, I begin IME input and console.log the editorState.toJS()
at the first press of keyboard,
the onChange fires twice.
here is the two editorState.toJS()
you can see the pre selected inline style (inlineStyleOverride) is gone during the first keyboard press.

What is the expected behavior?

support IME input

Which versions of Draft.js, and which browser / OS are affected by this issue? Did this work in previous versions of Draft.js?

draft-js: draftjs.org example
OS: window 10