From 2f084a7d1847f78172fc705149c8543cef7e9193 Mon Sep 17 00:00:00 2001
From: Andrew Blakeslee Moore <andrew@blakeslee.me>
Date: Mon, 6 Jul 2026 18:27:01 -0700
Subject: [PATCH] Transcript Incremental Projection

Nucleic-Session: 0FFD007B-0696-4517-9429-129C7B0FD5AC
Co-authored-by: Nucleic <nucleic@blakeslee.xyz>
---
 .../Transcript/TranscriptProjection.swift     | 28 +++++++++++++++++--
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/NucleicRemote/NucleicRemote/Views/Transcript/TranscriptProjection.swift b/NucleicRemote/NucleicRemote/Views/Transcript/TranscriptProjection.swift
index 2ca4205..bb22f9c 100644
--- a/NucleicRemote/NucleicRemote/Views/Transcript/TranscriptProjection.swift
+++ b/NucleicRemote/NucleicRemote/Views/Transcript/TranscriptProjection.swift
@@ -183,7 +183,15 @@ enum TranscriptProjection {
     /// `file_path` is stripped of `worktreeRoot` and normalized so it compares against the note's
     /// repo-relative paths. A note overlapping no preceding edit is left in place (renders
     /// standalone), matching the Mac's `foldLockNotes`.
-    private static func foldLockNotes(_ flat: [TranscriptItem], worktreeRoot: String?) -> [TranscriptItem] {
+    ///
+    /// The backward scan continues past the front of `flat` into `priorEdits` — the edits of
+    /// already-folded earlier segments, oldest first — so a note whose edit was sealed in a prior
+    /// segment (a lock released turns later) still folds exactly where a whole-stream fold would
+    /// put it. Those hits are reported via `priorLockPatches` for the caller to attach.
+    private static func foldLockNotes(
+        _ flat: [TranscriptItem], worktreeRoot: String?, priorEdits: [PriorEdit],
+        priorLockPatches: inout [(toolCallID: String, lock: NoteLock)]
+    ) -> [TranscriptItem] {
         // Each tool item's repo-relative edited paths (only edit-class tools have any), by index.
         var editsByIndex: [Int: (id: String, paths: [String])] = [:]
         for (i, item) in flat.enumerated() {
@@ -193,7 +201,8 @@ enum TranscriptProjection {
                 .filter { !$0.isEmpty }
             if !paths.isEmpty { editsByIndex[i] = (group.toolCallID, paths) }
         }
-        guard !editsByIndex.isEmpty else { return flat }
+        guard !editsByIndex.isEmpty || !priorEdits.isEmpty else { return flat }
+        let priorIDs = Set(priorEdits.map(\.toolCallID))
 
         var locksByCall: [String: [NoteLock]] = [:]
         var folded = Set<Int>()
@@ -212,13 +221,26 @@ enum TranscriptProjection {
                     guard let edit = editsByIndex[j] else { continue }
                     if edit.paths.contains(where: { pathsOverlap($0, path) }) { hitID = edit.id; break }
                 }
+                if hitID == nil {
+                    // Nothing in this segment — keep scanning backward across the seam, newest
+                    // prior edit first, exactly where a whole-stream scan would look next.
+                    for prior in priorEdits.reversed()
+                    where prior.paths.contains(where: { pathsOverlap($0, path) }) {
+                        hitID = prior.toolCallID
+                        break
+                    }
+                }
                 guard let hitID else { matchedAll = false; break }
                 if let k = indexByID[hitID] { perCard[k].paths.append(path) }
                 else { indexByID[hitID] = perCard.count; perCard.append((hitID, [path])) }
             }
             guard matchedAll, !perCard.isEmpty else { continue }
             for card in perCard {
-                locksByCall[card.id, default: []].append(NoteLock(state: lock.state, paths: card.paths))
+                if priorIDs.contains(card.id) {
+                    priorLockPatches.append((card.id, NoteLock(state: lock.state, paths: card.paths)))
+                } else {
+                    locksByCall[card.id, default: []].append(NoteLock(state: lock.state, paths: card.paths))
+                }
             }
             folded.insert(i)
         }