Describe the bug
In the markdown editor, when pasting code into a pre-existing fenced code block, a second code block is created inside.
To Reproduce
Steps to reproduce the behavior:
-
Open md editor
-
Create fenced code block ```
-
Paste anything detected as code into block - ex: copy the text below:
Expected behavior
Only the single (existing) fenced region is used
Screenshots

This will also render incorrectly if saved without manually fixing:

Desktop
- OS: Windows
- Browser: Chrome
- Version: v104