Formatting issue with split messages

[mangstadt]

When a long message is formatted in italics or bold, and the message is split to adhere to SO Chat's length limitations, the formatting gets broken. The splitting code should add formatting syntax onto the beginning/end of each split message in order to preserve the formatting. Instead, you just see asterisks at the beginning of the first message and at the end of the last message.

Transcript link: https://chat.stackoverflow.com/transcript/message/43331588#43331588