Enum FoldGrouping 

#[repr(u8)]
pub enum FoldGrouping {
    SourceFile = 0,
    HeaderRuns = 1,
}

AF.1: how a multibuffer view’s rows group for folding.

A per-VIEW property because the answer is not a property of multibuffers — it is a property of what a given provider’s rows mean, and the three shipped providers disagree:

• search headers every excerpt with its file path, and its excerpts arrive grouped by file, so a file IS a contiguous run;
• project-diff headers each hunk with its LINE NUMBER, so titles are neither unique nor a grouping key at all — only the source path is;
• the agenda headers the first row of each date/section run and blanks the rest, and its rows deliberately INTERLEAVE across files (OM.A2), so the source path is the one thing that is not a grouping.

Hence a declaration rather than a heuristic. A provider says how its rows group; the mode registers the matching fold source. Guessing from the excerpt shape would be right for two of the three and silently wrong for the third, which is how home.org’s fold came to swallow work.org’s rows.

Variants

SourceFile = 0

One fold per source file, spanning that file’s first excerpt to its last. The default, and correct wherever excerpts arrive grouped by file.

HeaderRuns = 1

One fold per HEADER RUN — what the user actually sees as a group.

Trait Implementations

impl Clone for FoldGrouping

fn clone(&self) -> FoldGrouping

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for FoldGrouping

impl Debug for FoldGrouping

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for FoldGrouping

impl PartialEq for FoldGrouping

fn eq(&self, other: &FoldGrouping) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for FoldGrouping