Collapsing headers adds a new line
- Dominant language
- JavaScript
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Description
Issue: making an header collapsible adds a white new line, and then the header summary.
To reproduce the issue, you can use the following snippet:
```
Header 1
Just a test.
```


As far as I noticed, this issue is different Markdown editors, except for GitHub, GitLab. I guess it depdends on the different markdown formatting style used by these two. Is it possible to fix this issue?
Below you can see that GitHub formats this snippet correctly:
Header 1
Just a test.
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