Fix empty RPROMPT handling in zsh.

[vorporeal]

Description

Fixes a zsh-specific issue where long commands could gain a duplicated leading character in finished command blocks after wrapping while using Warp's prompt.

When Warp hides a user-defined right prompt, the zsh bootstrap was recreating RPROMPT as an empty zero-width prompt. Although it rendered no visible content, zsh still performed right-prompt layout and redraw behavior, which could corrupt the captured command grid. This change leaves RPROMPT unset in Warp prompt mode, while preserving handling for real non-empty right prompts, and adds regression coverage for that behavior.

Linked Issue

N/A

Testing

• cargo fmt --all --manifest-path Cargo.toml --check
• git diff --check
• cargo check --manifest-path Cargo.toml -p integration
• cargo nextest run --manifest-path Cargo.toml --no-fail-fast -p integration -E 'test(test_warp_prompt_unsets_zsh_rprompt)'
• Manually reproduce the wrapped zsh command behavior after launching locally with ./script/run.

Screenshots / Videos

Not attached; manual end-to-end reproduction verification is pending.

Agent Mode

• Warp Agent Mode - This PR was created via Warp's AI Agent Mode

Changelog Entries for Stable

CHANGELOG-BUG-FIX: Fixed duplicated leading characters in wrapped zsh command blocks when using the Warp prompt.

Co-Authored-By: Oz oz-agent@warp.dev

[vorporeal]

• Fix empty RPROMPT handling in zsh. #11868 👈 (View in Graphite)
• master

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[oz-for-oss]

@vorporeal

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[oz-for-oss]

Overview

This PR adjusts zsh bootstrap handling so Warp prompt mode no longer synthesizes an empty RPROMPT, and adds zsh integration coverage for the unset right-prompt behavior.

Concerns

• For this user-facing terminal rendering change, please include screenshots or a short screen recording demonstrating the wrapped zsh command behavior working end to end. The PR description currently says screenshots/videos are not attached and manual end-to-end reproduction is pending.

Verdict

Found: 0 critical, 1 important, 0 suggestions

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