Struct DiffRenderState 

pub struct DiffRenderState {
    pub sign_map: Arc<DiffSignMap>,
    pub sign_maps: Arc<HashMap<BufferId, Arc<DiffSignMap>>>,
    pub active_session_hunk_count: Option<usize>,
}

D.3.d.1 (2026-05-29): renderer-side projection of the active document’s diff overlay state. Carries the DiffSignMap for the gutter-sign column; future D.3.e (line tints) reads through the same map.

sign_map defaults to an empty Arc<DiffSignMap> so renderers never have to handle the Option path; an empty map’s sign_at is None for every line.

Fields

sign_map: Arc<DiffSignMap>

sign_maps: Arc<HashMap<BufferId, Arc<DiffSignMap>>>

D-fix.3b: per-buffer sign maps for EVERY live diff session, so a side-by-side diff tints BOTH panes — each pane reads its own buffer’s map by BufferId. The proposed/current (right) buffer maps to the current-side sign_map(); the baseline (left) buffer maps to the baseline_sign_map(). Renderers look up sign_maps.get(buffer_id) per pane; the legacy single sign_map above stays the active-doc map for the modeline hunk count.

active_session_hunk_count: Option<usize>

D.3.g (2026-05-29): hunk count for the active document’s DiffSession, if any. None means no session is open for the active buffer. Some(0) means a session is open but the buffer currently matches baseline (no hunks). The modeline diff-mode indicator reads this to render [diff: N hunks] only when a session is active.

Trait Implementations

impl Clone for DiffRenderState

fn clone(&self) -> DiffRenderState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DiffRenderState

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

Formats the value using the given formatter.

impl Default for DiffRenderState

fn default() -> DiffRenderState

Returns the “default value” for a type.