Details
Description
I found that characters were collapsed when I was writing texts in non-English lauguage using IME.
On the other hand, there were no collapse, when I wrote texts without IME.
The detailed image is shown in my screen capture that I will attach.
My environment where I saw this situation is CentOS7 + Firefox37 and Fedora19 + Firefox37 and Windows8.1 + Firefox37.
I think that one reason is "opacity" of .ace_text-input.ace_composition.
This makes some troubles in some environments.