Markdown tables do not handle vertical bar inside code block correctly

• Gogs version (or commit ref): 0.11.19.0609
• Git version: 2.14.1
• Operating system: Windows 10
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gogs.io: https://try.gogs.io/nikonthethird/TestingTableIssue/src/master/README.md
  • Yes (provide example URL)
  • No
  • Not relevant
• Log gist (usually found in log/gogs.log): Not relevant.

Description

Tables containing a vertical bar | in a code block interpret it as a column separator.

I noticed it when trying to add the TypeScript type number | null inside a table cell.
The cell should contain the vertical bar, but instead it is split into two cells.

Start with the reproduction URL in the issue and compare how a table cell containing a code block with number | null is rendered. Trace the Markdown table handling from that example and verify that the vertical bar remains inside the code block's cell rather than becoming a column separator.