Accented characters after a space renders an extra accent

[mbillard]

Issue

When typing a word that starts with an accented character (such as the single letter word "à" in French), an extra accent appears instead of the space before the word.

How to reproduce

You need a keyboard layout that supports typing accented characters in this way: type accent first, then type the letter (ex: "`" then "a").

• Go to https://bustle.github.io/mobiledoc-kit/demo/
• Enter some characters, then a space then an accent followed by a valid letter (ex: "`" then "a")

Expected

Some characters à

Actual

Some characters`à

[mbillard]

Furthermore, I'm not sure if it's related but in the demo I cannot type such an accented character as the very first character of the content. I can create a separate issue if you want.

[kevinansfield]

I believe this is a duplicate of or at least a symptom of the same underling problem in #589 and #548