Unify fold headers and callouts

[peeragetalkers]

This would be a very useful addition indeed

This request was further expanded upon in:

Pre-folded (pre-collapsed) headings

Use case or problem Some of a note sections (text under headings), e.g., “Used abbreviations”, are expected to be rendered collapsed/folded when a note is opened in the “View” mode. While callouts can be marked with “-” and “+” characters (e.g., “> [!INFO]- Title” or “> [!INFO]+ Title”) to render them as collapsed/collapsable, this feature is missing for headers. This need comes from use cases when a collapsed callout cannot be used. E.g., a list of use abbreviations like the following won’t…