[DailenG]

Updating across several releases (1.3.0 to 1.4.2) showed only the newest release notes. The old version was read from the record file and then thrown away.

What changes

• build.rs embeds the whole CHANGELOG.md instead of one version's section.
• whats_new::notes(from, current) builds the window text when it opens: every release newer than from up to current, newest first, under the usual heading, plus a line "You updated from X: this covers all N releases since." when more than one.
• read_and_record now also returns the version that was on record.
• Versions compare as numeric major.minor.patch (changelog::parse_version), so a packaged install's four-part 1.4.2.0 matches the changelog's 1.4.2, and a nightly of the same release is not an update.
• Fallbacks keep the old behaviour: no record, an unparseable one, an equal or newer one (rollback), or no release inside the range shows the current release (or Unreleased for a dev build). The palette row passes no from, so it shows the current release only.

Cost

The changelog (about 40 KB) was already read at build time; it is now embedded whole. The range is computed once, after the first frame, only when the window opens, so the startup budget is untouched.

Verified

• cargo xtask ci (40 tests in tachyon, including ranges, four-part versions, every fallback, non-version headings) and Windows clippy pass.
• Real app (Linux, private instance, record file set to 1.3.0): the window opened as "What's new in Tachyon 1.4.2" with the range line and the 1.4.2, 1.4.1 and 1.4.0 sections, newest first; the record was rewritten to 1.4.2.
• Not verified: a packaged Windows install (the 1.4.2.0 path is covered by a unit test, not run for real).

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Review configuration:

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 3f93891d-4e3d-43f0-89aa-0dc628aeff83

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📥 Commits

Reviewing files that changed from the base of the PR and between 27064a8 and 8e48edd.

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📒 Files selected for processing (2)

• crates/tachyon/src/changelog.rs
• crates/tachyon/src/whats_new.rs

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📝 Summary

Summary by CodeRabbit

• New Features
  • After an update, the What’s New window now shows all releases newer than the previously used version, with the newest first and the starting version identified.
  • On a fresh install, when the previous version can’t be read, or when opened manually, the window shows only the current release.
• Documentation
  • Updated the changelog to describe the release-notes behavior.

Walkthrough

The build embeds the full changelog. At runtime, the What's New window selects release sections using the current version and, for automatic openings, the previously recorded version.

Changes

Release notes

Layer / File(s)	Summary
Embed and select changelog sections CHANGELOG.md, crates/tachyon/build.rs, crates/tachyon/src/changelog.rs	The build embeds the full changelog. Changelog code parses release versions and selects matching sections, including fallback behavior.
Generate notes and return the prior version crates/tachyon/src/whats_new.rs	What's New generation joins matching sections newest first. Version recording returns the prior nonempty version when available. Tests cover section output and stored-version results.
Pass the version range to What's New crates/tachyon/src/app.rs	Automatic openings pass the previously recorded version to notes generation. On-demand openings request notes for the current version only.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant App
  participant WhatsNew
  participant VersionRecord
  participant EmbeddedChangelog
  App->>WhatsNew: Read and record current version
  WhatsNew->>VersionRecord: Read stored version
  VersionRecord-->>WhatsNew: Return stored version or no value
  WhatsNew-->>App: Return version check and prior version
  App->>WhatsNew: Generate notes for prior and current versions
  WhatsNew->>EmbeddedChangelog: Select matching release sections
  EmbeddedChangelog-->>WhatsNew: Return release sections
  WhatsNew-->>App: Return notes

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Merge Risk: 🔵 Low · up to 27064

On development builds, the What's New window can say it covers one more release than it actually lists. Release builds are unaffected, so merge risk is low.

Pre-merge checks · 5

Passed checks (5 passed)

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: displaying every release since the recorded version.
Description check		The description explains the problem, implementation, fallback behavior, verification steps, test results, and the unverified packaged Windows scenario. It includes all required template sections.
Docstring Coverage		Docstring coverage is 86.67% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 30 functions across 4 files. (1 skipped: 1 …
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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• Commit to this branch
• Create a new PR

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• Commit to this branch
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_{A rabbit reads the changelog by moonlit light,
Newer release notes hop into sight.
The old version marks where the range will start,
The newest notes arrive, each in its part.
Then rabbit tucks the list away till next update.}

_{Comment @coderabbitai help to get the list of available commands.}

[DailenG]

@coderabbitai the finding is fixed in 27064a8 (Unreleased shown ahead of the releases a development build jumped over); thread replied to and resolved. Please re-review the current head.

[coderabbitai]

@DailenG Thanks for fixing the finding in 27064a8. I’ll re-review the current head, including whether development builds show Unreleased before the releases skipped during the update.

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[DailenG]

@coderabbitai approve

[coderabbitai]

✅ Action performed

Comments resolved and changes approved.