Shift+Enter does not insert newline in input on Windows Terminal

Description

When using Claude Code inside Windows Terminal (PowerShell), Shift+Enter does not create a new line in the input field. Instead, it behaves the same as Enter and submits the message immediately.

Expected behavior

Shift+Enter should insert a newline, allowing multi-line input — the same way it works in the PowerShell prompt itself (where Shift+Enter produces a continuation line >>).

Actual behavior

Shift+Enter submits the message, identical to pressing Enter. There is no way to enter multi-line text via keyboard.

Environment

• Claude Code version: v2.1.71
• OS: Windows 11 Pro (10.0.26200)
• Terminal: Windows Terminal / PowerShell
• Model: Opus 4.6

Screenshot

Shift+Enter works in PowerShell (before launching claude), but not inside Claude Code's input prompt.