Add feature to limit show context.

[sebschmi]

No description provided.

[Copilot]

Pull request overview

This PR adds an option to restrict how much sequence context is rendered around template switches when generating the SVG output, plumbing a new CLI flag through to the SVG renderer and introducing arrangement-trimming utilities to remove columns outside the desired context window.

Changes:

• Add --restrict-context-to <N> to tsalign show and pass it into lib_tsshow::svg::SvgConfig.
• Extend SVG generation to optionally crop both TS and no-TS arrangements to a shared context range.
• Add arrangement utilities for context limiting and range-based column removal, plus supporting helpers (source lengths, saturating subtraction).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tsalign/src/show.rs	Adds CLI flag and forwards it into SvgConfig.
lib_tsshow/src/ts_arrangement/source.rs	Stores original reference/query lengths and exposes accessors used as fallbacks for cropping.
lib_tsshow/src/ts_arrangement/index_types.rs	Adds saturating_sub for index newtypes.
lib_tsshow/src/ts_arrangement.rs	Introduces context-limiting and column-range removal utilities, plus “interesting column” detection.
lib_tsshow/src/svg.rs	Applies context restriction to TS arrangement and mirrors the same crop window onto the no-TS arrangement.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.