hypen in new line makes the previous line to an <h2>

[killerbytes]

Input:
test

Expected output:

test
-

Actual Output:

test

https://jsfiddle.net/killerbytes/gzfxhs3L/1/

I guess this is a markdown issue since it also affects github's editor

Edit: I found out this is called setext Anyway to disable it?

[KilianU]

The config option smoothLivePreview might deliver a small mitigation as it requires at least two hyphens to make a heading.