fix(app): support slash command picker on any line of multiline input

[0xSkybreaker]

Issue for this PR

Closes#34693

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

The slash command picker (/ trigger) in the web chat input only worked when the cursor was at position 0 — typing text first, pressing Shift+Enter, and then typing / on a new line would not trigger the picker.

Changed the regex from whole-string anchor to cursor-aware line-start match, consistent with the existing @mention trigger approach:

// beforeconstslashMatch=rawText.match(/^\/(\S*)$/)// afterconstslashQuery=rawText.substring(0,cursorPosition)constslashMatch=slashQuery.match(/(?:^|\n)\/(\S*)$/)

How did you verify your code works?

Code review — the fix mirrors the exact pattern used by the @mention trigger which already handles multiline input correctly. The change is a 2-line diff.

Screenshots / recordings

No UI change — picker now opens on any line instead of only at position 0.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicate Found:

• PR feat(app,tui): slash picker on any line and multi-command prompts #34710: feat(app,tui): slash picker on any line and multi-command prompts
  • feat(app,tui): slash picker on any line and multi-command prompts #34710

This PR appears to address the exact same issue: supporting the slash command picker on any line of multiline input. It covers both the app and TUI components, while PR #34728 (the current PR) focuses on the app component. These PRs likely overlap significantly in functionality and should be reviewed together to avoid duplicate work.

[github-actions]

Thanks for your contribution!

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[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[0xSkybreaker]

Superseded by #34710 which has a more complete fix.