Struct DocumentEntry 

pub struct DocumentEntry {
    pub id: BufferId,
    pub handle: Arc<dyn Document>,
}

Per-document registry payload. Each entry carries the actor handle plus per-document tree-sitter Syntax state, fold list, and any other “lives with this buffer until it closes” state.

Active vs inactive split. The currently-active buffer’s syntax / folds slots are conventionally None / empty because the live state lives on App.syntax / App.folds for hot-path access. Switching buffers via App::activate_document snapshots the old buffer’s live state into its entry, then loads the destination’s state from its entry into the App’s hot-path fields. The App::activate_buffer_state hook then refreshes anything that needs recomputing for the newly-active buffer (e.g. fold recompute when switching into a buffer for the first time).

Fields

id: BufferId

handle: Arc<dyn Document>

M.0 (2026-05-31): typed as Arc<dyn Document> so the registry can hold either a regular RopeDocumentHandle (today) or a MultibufferDocumentHandle (M.1) without kind-branching at retrieval. Consumers read through the Document trait directly; concrete-type access (e.g., RopeDocumentHandle::replace-equivalent operations that don’t apply to multibuffer) is gone — slot replacement / membership APIs handle those cases.

Trait Implementations

impl Debug for DocumentEntry

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

Formats the value using the given formatter.