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claude-code - 💡(How to fix) Fix [Bug] Inline-mode scrollback duplication persists on Windows Terminal (2.1.119)

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Root Cause

Bug Description Inline-mode scrollback duplication on 2.1.119 (Windows Terminal + PowerShell). A single assistant response is re-rendered ~10 times into terminal scrollback as text streams. Duplicates are persistent in scroll history, not transient flicker. Reproduces with effortLevel=high on long planning responses, with or without tool calls. Recent changelog claims this was fixed in 2.1.116 (scrollback duplication, inline mode), 2.1.117 (Ctrl+L / redraw on Windows Terminal), and 2.1.118 (non-fullscreen resize/dialog/long sessions), but it still reproduces on 2.1.119. Repro:

Windows Terminal, PowerShell profile /tui confirms inline renderer effortLevel=high Send a planning-style query that elicits a long multi-section response Response renders ~10x in scrollback

Env:

Claude Code 2.1.119 Windows 11 Windows Terminal + PowerShell inline renderer CLAUDE_CODE_NO_FLICKER not set effortLevel high Settings show autoUpdatesChannel=latest but /config reports auto-update disabled (possible config discrepancy)

Related: #52866 (sequential tool-call re-render), #48318 (general 2.1.x duplication), #11038 (Windows Terminal resize trigger). Possibly same root cause as one of these despite the recent fixes. Have not yet tested /tui fullscreen for comparison — will follow up in a comment if it changes behavior.

Code Example

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Bug Description Inline-mode scrollback duplication on 2.1.119 (Windows Terminal + PowerShell). A single assistant response is re-rendered ~10 times into terminal scrollback as text streams. Duplicates are persistent in scroll history, not transient flicker. Reproduces with effortLevel=high on long planning responses, with or without tool calls. Recent changelog claims this was fixed in 2.1.116 (scrollback duplication, inline mode), 2.1.117 (Ctrl+L / redraw on Windows Terminal), and 2.1.118 (non-fullscreen resize/dialog/long sessions), but it still reproduces on 2.1.119. Repro:

Windows Terminal, PowerShell profile /tui confirms inline renderer effortLevel=high Send a planning-style query that elicits a long multi-section response Response renders ~10x in scrollback

Env:

Claude Code 2.1.119 Windows 11 Windows Terminal + PowerShell inline renderer CLAUDE_CODE_NO_FLICKER not set effortLevel high Settings show autoUpdatesChannel=latest but /config reports auto-update disabled (possible config discrepancy)

Related: #52866 (sequential tool-call re-render), #48318 (general 2.1.x duplication), #11038 (Windows Terminal resize trigger). Possibly same root cause as one of these despite the recent fixes. Have not yet tested /tui fullscreen for comparison — will follow up in a comment if it changes behavior.

Environment Info

  • Platform: win32
  • Terminal: windows-terminal
  • Version: 2.1.119
  • Feedback ID: 88773e32-2028-4f63-808e-90544e8db6f7

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