`mdsh` clobbers code block immediately following command substitution

[cole-h]

Take the following in.md file as an example:

`$ echo hi`

\```
bye
\```

After running mdsh --input in.md --output out.md, out.md looks like the following:

`$ echo hi`
\```
hi
\```

Notice how the "bye" code block is now missing.

This can be worked around by adding a dummy code block or HTML comment after command substitutions, e.g. <!-- --> or

\```
\```

[zimbatm]

Initially, mdsh was only replacing the fenced block if it was right on the next line. But there is a markdown formatting tools called "prettier" that adds back an empty line in between both blocks. So I relaxed that rule for both tools to work together. But now we're hitting the issue you described.

This is all a bit hacky.

Maybe mdsh should always add comment sections, as it does for the HTML output. That would make it more verbose but less ambiguous.

[cole-h]

Do you remember where that next-line check was (or which commit removed it)? I could just patch that out until a reasonable solution is decided upon, seeing as I don't use prettier.

[zimbatm]

This was introduced in the last release (v0.6.0). Reverting to 0.5.0 should be fine.

[juhp]

One idea could be to add a option to require no newline: though I am fine with the current behavior.