Struct UiDiffFoldUnchanged 

pub struct UiDiffFoldUnchanged;

Fold the unchanged regions of a diff so only the changes (± UiDiffContext lines) remain visible — vimdiff’s foldmethod=diff, VS Code’s “Collapse Unchanged Regions”.

true (default) — every diff session gets a closed UnchangedFoldSource on each side; zR / zo expand a region to read the surrounding context, zM re-collapses.

false — diffs open fully expanded (the unchanged code stays visible). Hunk folds (za on a change) are unaffected — those are a separate, open-by-default source.

Implementations

impl UiDiffFoldUnchanged

pub fn build_spec() -> Option<bool>

Build the runtime spec for this declaration. Used by the registry’s self-registration boot path; not generally called by hand. Direct construction of Option<T> is the macro’s internal-only path – consumer code uses config.get_typed::<#name_ident>() to read and config.set_typed::<#name_ident>(...) to write.

Trait Implementations

impl HasGroup for UiDiffFoldUnchanged

const GROUP_NAME: &'static str = <lattice_config::Display as ::lattice_config::OptionGroup>::NAME

Group display name ("editor", "lsp", …). The macro pulls this from the group = SomeGroup; directive at the declaration block’s head.

impl OptionDecl for UiDiffFoldUnchanged

const NAME: &'static str = UiDiffFoldUnchanged

Public display name. Boundary-facing only – :set <NAME>=…, TOML keys, completion candidates, :describe-option. Internal access is type-driven. The macro derives this from the option’s identifier (with namespace prefix when declared via mode_options!); manually-typed NAMEs are not supported for built-in options.

const DOC: &'static str = UiDiffFoldUnchanged

Doc string. Shown in :describe-option, the :customize form’s per-row help, and :apropos results.

const CUSTOMIZABLE: bool = true

Customize-visibility flag. true (the default) ⇒ option appears in :set autocomplete + the :customize group view. false ⇒ plugin / engine-internal state, hidden from user surfaces. Equivalent of emacs’s defvar vs defcustom. (See mode-architecture.md §6.5.3.)

type Value = bool

The runtime value type. bool, i64, String, plus any domain enum that impls [OptionType].

fn default_value() -> Self::Value

Default value. Returned by a function (rather than a const) so non-const-constructible types like String can be defaults.

fn type_id() -> TypeId

where Self: Sized,

TypeId of the declaration type itself. Hot-path key for the registry’s type-driven storage. Default impl works for every concrete impl.