The cursor cannot locate correctly when Roman number included visually

[stonetalons]

When text with some Roman number just like Ⅳ、Ⅱ，the editor cursor cannot locate correct visually，which makes me confused a lot.

Here's an instance on ur homepage, the cursor is supposed to locate at the end of this line while it locates at the middle appearently.
I tried changing my font-size,font-family,but still did't work

[andrewnester]

Related to #460

[andrewnester]

Closing as duplicate of #460