pub fn compute_markdown_folds(buffer: &Buffer) -> Vec<Fold>Expand description
Markdown heading-based fold provider (DESIGN.md §15:18,
docs/user/folding.md). Walks the buffer for ATX headings
(^#+\s) and emits one fold per heading whose body has at
least one row. Heading depth (the number of #s) determines
nesting: a ## H2 ends at the next same-or-shallower heading
(# H1 or another ## H2 or end-of-buffer).
Code-fence aware: ^```` lines toggle a "in fenced block" state; #`-prefixed lines inside a fenced block are not headings. The
fence itself is included in whichever fold contains it.
Lines inside fenced code blocks of the form ~~~ are also
excluded from heading detection, mirroring CommonMark §4.5.