Nested code blocks are not supported, corrupting files using it

[FlorianLudwig]

Description

• Can you reproduce the issue?

Steps to reproduce

1. Have a file with nested code blocks:

````markdown

```python

def code_block():
    pass
```

````

2. load file
3. save file
4. file syntax corrupted:

```markdown

```python

def code_block():
    pass
```

```

Expected behavior:

Don't change the files meaning.

Versions

• Mark Text: v0.16.1

[brainchild0]

Loosely related to #2189.

If the application would retain the literal number of backtick (`) characters that bound the code block, then the intended meaning of the original document, of nested code blocks, would be preserved.