Simplify & improve bold+italic

[anjiro]

I realized my earlier PR #7 didn’t work for *bold with _embedded italic_ text* and _italics with *bold* text inside_. In the course of fixing that I simplified the code.

[lervag]

I'm not sure this works as you think. At least, on my end, this no longer allows bold italics at all...

[lervag]

That is, at the current master, *_...._* will give bold italics. With your PR, it will be only bold.

[anjiro]

Hm, how strange… it worked briefly then stopped. I’ll investigate further.

[lervag]

You added the contained to the syntax groups, but no other groups contain them. I believe it may be fixed by adding contains=... somewhere appropriate.

[anjiro]

Yes, you’re right—I had to do some file shuffling to get the repository in the right place to do the PR and lost those lines. Try now?

[lervag]

Thanks, works now!