fix(cli): stop resize repaint from causing scroll storm

packages/cli/src/ui/AppContainer.test.tsx

@@ -1092,13 +1092,10 @@ describe('AppContainer State Management', () => {
       expect(capturedUIState.useTerminalBuffer).toBe(true);
     });
 
-    // #4891 changed the resize contract: width changes now trigger ONE full
-    // clearTerminal after RESIZE_REPAINT_SETTLE_MS (trailing-edge debounce),
-    // instead of never (#3967) or per-event (pre-#3967). This test pins the
-    // synchronous half: no immediate clear during the burst. The settle-time
-    // half is not observable here — ink-testing-library's rerender does not
-    // flush update-time passive effects — and is covered by
-    // useResizeSettleRepaint.test.ts.
+    // Resize no longer triggers a clearTerminal or history remount (#8004).
+    // The old settle → refreshStatic path caused a scroll storm; the dynamic
+    // region now re-renders via useTerminalSize alone. This test pins that
+    // no synchronous clear fires during a width change.
     it('does not clear the terminal synchronously on width change', () => {
       vi.spyOn(mockConfig, 'initialize').mockResolvedValue(undefined);
       mockedUseTerminalSize.mockReturnValue({ columns: 80, rows: 24 });
@@ -1127,6 +1124,43 @@ describe('AppContainer State Management', () => {
       );
     });
 
+    it('does not repaint static history after a resize settles (#8004)', () => {
+      vi.useFakeTimers();
+      vi.spyOn(mockConfig, 'initialize').mockResolvedValue(undefined);
+      mockedUseTerminalSize.mockReturnValue({ columns: 80, rows: 24 });
+      const { rerender } = render(
+        <AppContainer
+          config={mockConfig}
+          settings={mockSettings}
+          version="1.0.0"
+          initializationResult={mockInitResult}
+        />,
+      );
+      mockStdout.write.mockClear();
+
+      mockedUseTerminalSize.mockReturnValue({ columns: 100, rows: 24 });
+      rerender(
+        <AppContainer
+          config={mockConfig}
+          settings={mockSettings}
+          version="1.0.0"
+          initializationResult={mockInitResult}
+        />,
+      );
+
+      // Advance well past the old RESIZE_REPAINT_SETTLE_MS (200ms) debounce.
+      // The removed settle -> refreshStatic path wrote clearTerminal here; the
+      // new contract never does, so a future re-introduction would fail this.
+      act(() => {
+        vi.advanceTimersByTime(500);
+      });
+
+      expect(mockStdout.write).not.toHaveBeenCalledWith(
+        ansiEscapes.clearTerminal,
+      );
+      vi.useRealTimers();
+    });
+
     it('handleClearScreen avoids a second clearTerminal write', () => {
       const clearSpy = vi.spyOn(console, 'clear').mockImplementation(() => {});
 

packages/cli/src/ui/AppContainer.tsx

@@ -119,7 +119,6 @@ const MCP_BATCH_FLUSH_MS = 16;
 const STARTUP_PROFILE_FINALIZE_CAP_MS = 35_000;
 import { useHistory } from './hooks/useHistoryManager.js';
 import { useMemoryMonitor } from './hooks/useMemoryMonitor.js';
-import { useResizeSettleRepaint } from './hooks/useResizeSettleRepaint.js';
 import { useWakeRepaint } from './hooks/use-wake-repaint.js';
 import { useThemeCommand } from './hooks/useThemeCommand.js';
 import { useFeedbackDialog } from './hooks/useFeedbackDialog.js';
@@ -3245,8 +3244,12 @@ export const AppContainer = (props: AppContainerProps) => {
     }
   }, [terminalWidth, availableTerminalHeight, activePtyId]);
 
-  // Repaint static history on the trailing edge of a resize burst (#4891).
-  useResizeSettleRepaint(terminalWidth, refreshStatic);
+  // Resize no longer repaints static history (#8004). The old settle →
+  // refreshStatic path wrote clearTerminal (destroying scrollback) and remounted
+  // <Static>, re-emitting all history in 50-item chunks — a scroll storm when
+  // the terminal's resize animation exceeded the debounce window (e.g. Ghostty
+  // panel toggle). Ink's dynamic region already re-renders on width changes via
+  // useTerminalSize; modern terminals reflow scrollback natively.
 
   // Repaint after the process resumes from OS sleep / suspend (lid close,
   // display sleep, Ctrl+Z → fg).  The terminal's screen buffer is stale but