[Bug] Shift+Enter multiline input ignored when CLAUDE_CODE_NO_FLICKER=1 in Warp

Bug Description
shift+enter isn't respected in Warp + Claude Code if "CLAUDE_CODE_NO_FLICKER" is set to 1
shift+enter works the same as enter when "CLAUDE_CODE_NO_FLICKER" is set to 1

after removing "CLAUDE_CODE_NO_FLICKER" and restarting claude code, the shift+enter started to work again

Environment Info

• Platform: darwin
• Terminal: WarpTerminal
• Version: 2.1.90
• Feedback ID: c50c3274-edb4-4306-b46c-08fae43a4400

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/drozdgabriel/.local/share/claude/versions/2.1.90 (expected in multi-process scenarios)\n    at Cu_ (/$bunfs/root/src/entrypoints/cli.js:1894:2138)\n    at uQ6 (/$bunfs/root/src/entrypoints/cli.js:1894:1218)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-02T10:13:49.533Z"}]