text after "someKey: |" is colorized differently if a leading newline exists.

[alexr00]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.62.3
• OS Version: Ubuntu 18.04.6 LTS

Steps to Reproduce:

1. code --disable-extensions
2. create the following .yml file

someKey: |

  *Some description*
  which is multiline

3. Observe that "Some" word has another color (issue)
4. Now remove the leading newline
5. Observe that the whole string has the same color (expected behavior)

Originally from @ghuser in microsoft/vscode#138244

[nielsole]

This also happens with the > character: microsoft/vscode#196077