V2 of LiveText: pumped generator follow-up

[codeofdusk]

Link to issue number:

#20177, supersedes #20216.

Summary of the issue:

After #20177:

• It is impossible to tell whether lines have been skipped during large text floods;
• Copyright and attributions were outdated or missing.

Description of how this pull request fixes the issue:

This PR:

• Updates copyright and attribution;
• Adds a "beep for skipped lines" option to terminal programs settings.

Testing strategy:

Verified that the beep works as expected. Alpha testing.

Known issues with pull request:

None known

Code Review Checklist:

• Documentation:
  • Change log entry
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• API is compatible with existing add-ons.
• Security precautions taken.

[Copilot]

Pull request overview

This PR is a follow-up to the LiveText “pumped generator” work, adding user feedback for cases where large terminal floods cause line truncation, and updating attribution/changelog text accordingly.

Changes:

• Add a new Advanced Settings option to beep when terminal live-text bursts are truncated (skipped lines).
• Implement a variable-duration beep when LiveText.MAX_LINES truncation occurs.
• Update user documentation and changelog attribution for the related LiveText work.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
user_docs/en/userGuide.md	Documents the new “Beep for skipped lines” advanced setting.
user_docs/en/changes.md	Updates the changelog entry metadata/attribution for the LiveText work.
source/NVDAObjects/behaviors.py	Adds beep logic and duration calculation when lines are truncated by MAX_LINES.
source/gui/settingsDialogs.py	Adds the new checkbox to Advanced Settings and wires it into save/default handling.
source/config/configSpec.py	Adds the new terminals.beepForSkippedLines config setting (default enabled).

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[seanbudd]

Thanks @codeofdusk

[Qchristensen]

Userguide reads well

[codeofdusk]

@seanbudd I'm trying to make this a subitem but the automatic lint is fighting me here.