[GitHub] [airflow] sweco opened a new issue #16138: doc_md code block collapsing lines

[GitBox]

sweco opened a new issue #16138:
URL: https://github.com/apache/airflow/issues/16138


   **Apache Airflow version**: 2.0.0 - 2.1.0
   
   **Kubernetes version**: N/A
   
   **Environment**:
   
   - **Cloud provider or hardware configuration**: Docker on MacOS (but also 
AWS ECS deployed)
   - **OS** (e.g. from /etc/os-release): MacOS Big Sur 11.3.1
   - **Kernel** (e.g. `uname -a`): Darwin Kernel Version 20.4.0
   - **Install tools**:
   - **Others**:
   
   **What happened**:
   
   When a code block is a part of a DAG's `doc_md`, it does not render 
correctly in the Web UI, but collapses all the lines into one line instead.
   
   **What you expected to happen**:
   
   The multi line code block be rendered with line breaks preserved.
   
   **How to reproduce it**:
   Create a DAG with `doc_md` containing a code block:
   
   ````python
   from airflow import DAG
   
   DOC_MD = """\
   # Markdown code block
   
   Inline `code` works well.
   
   ```
   Code block
   does not
   respect
   newlines
   ```
   """
   
   dag = DAG(
       dag_id='test',
       doc_md=DOC_MD
   )
   ````
   
   The rendered documentation looks like this:
   <img 
src="https://user-images.githubusercontent.com/11132999/119981579-19a70600-bfbe-11eb-8036-7d981ae1f232.png";
 width="50%"/>
   
   **Anything else we need to know**: N/A
   
   


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