Struct LayoutNodeData 

pub struct LayoutNodeData {
    pub block_id: String,
    pub block_stack: Vec<String>,
    pub active_block_id: String,
    pub extra: Map<String, Value>,
}

Leaf-only payload — references the block this layout leaf renders. Group nodes (those with children) carry no data.

Fields

block_id: String

The currently-rendered block for this leaf. Always kept in sync with active_block_id when block_stack is non-empty — this field is what every existing (pre-tabs) reader/pruner cares about, so a leaf with no stack behaves identically to before this field existed.

block_stack: Vec<String>

In-pane tabs (SPEC_PANE_TAB_STRIP_AGENT_TERMINAL_2026_07_20.md §4.3): every blockId hosted by this leaf, ordered; empty/absent means “no stack, just block_id” — 100% back-compat with every layout written before this field existed. When non-empty, block_id MUST equal active_block_id and MUST be a member of this list.

active_block_id: String

The active member of block_stack. Empty/unused when block_stack is empty. Kept as an explicit field (rather than only ever reading block_id) so intent is unambiguous in the wire format.

extra: Map<String, Value>

Catch-all for unknown fields — preserves forward-compat when the frontend writes additional fields we don’t yet model. Uses serde_json::Map (insertion-ordered) for deterministic round-trips.

Trait Implementations

impl Clone for LayoutNodeData

fn clone(&self) -> LayoutNodeData

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LayoutNodeData

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

Formats the value using the given formatter.

impl Default for LayoutNodeData

fn default() -> LayoutNodeData

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for LayoutNodeData

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for LayoutNodeData

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for LayoutNodeData

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for LayoutNodeData