fix(cloud): WAKE-SCROLLBACK-SCROLL scroll back with intent enforcement paused (its synchronous follow-output snapped back), then pin

src/renderer/src/components/terminal-pane/pty-connection/output/replay-data-drain.ts

@@ -1,5 +1,9 @@
 import { RELEASE_SYNCHRONIZED_OUTPUT } from '../../../../../../shared/terminal/protocol/input-modes/terminal-mode-reset-profiles'
 import { syncTerminalScrollIntentFromViewport } from '@/lib/pane-manager/terminal-scroll-intent'
+import {
+  beginTerminalScrollIntentBufferRebuild,
+  endTerminalScrollIntentBufferRebuild
+} from '@/lib/pane-manager/terminal-scroll-intent-rebuild'
 import {
   cancelDeferredScrollRestore,
   cancelPendingFitScrollRestore
@@ -199,18 +203,26 @@ export function bindReplayDataDrain(session: ConnectPanePtySession): void {
         continue
       }
       if (preSleep) {
+        const terminal = session.pane.terminal
         await finishWakeScrollbackRestore(
           preSleep,
-          session.pane.terminal,
-          session.writeReplayDataAsync
+          terminal,
+          session.writeReplayDataAsync,
+          (line) => {
+            // The person's place wins: drop restores captured before it (a remount's first fit, at
+            // the bottom), scroll with intent enforcement paused (its synchronous "follow output"
+            // would snap back), then record the place as a pin for the fits still to come.
+            cancelDeferredScrollRestore(terminal)
+            cancelPendingFitScrollRestore(terminal)
+            beginTerminalScrollIntentBufferRebuild(terminal)
+            try {
+              terminal.scrollToLine(line)
+            } finally {
+              endTerminalScrollIntentBufferRebuild(terminal)
+            }
+            syncTerminalScrollIntentFromViewport(terminal, { allowBufferShrink: true })
+          }
         )
-        if (preSleep.scrolledTo !== null) {
-          // The person's place wins: drop restores captured before it (a remount's first fit, at the
-          // bottom, waiting for a later fit) and record it as a pin for the fits still to come.
-          cancelDeferredScrollRestore(session.pane.terminal)
-          cancelPendingFitScrollRestore(session.pane.terminal)
-          syncTerminalScrollIntentFromViewport(session.pane.terminal, { allowBufferShrink: true })
-        }
         if (!isCurrentPayload()) {
           continue
         }

src/renderer/src/lib/orca-cloud/cloud-wake-scrollback.ts

@@ -319,7 +319,9 @@ export function composeWakeRestore(block: string, terminal: WokenTerminal): stri
 export async function finishWakeScrollbackRestore(
   restore: WakeScrollbackRestore,
   terminal: WokenTerminal,
-  write: (data: string) => Promise<void>
+  write: (data: string) => Promise<void>,
+  /** Puts the person back on their line; the pane may pass one that keeps its scroll intent in step. */
+  scrollTo: (line: number) => void = (line) => terminal.scrollToLine(line)
 ): Promise<boolean> {
   const data = composeWakeRestore(restore.block, terminal)
   if (data !== null) {
@@ -333,7 +335,7 @@ export async function finishWakeScrollbackRestore(
     return false
   }
   if (restore.scrolledTo !== null) {
-    terminal.scrollToLine(restore.scrolledTo)
+    scrollTo(restore.scrolledTo)
   }
   return true
 }