Highlight changing expressions in Live Watch

[omarArm]

Fixes

• #850

Changes

• Now changing expressions will get highlighted in the Live Watch

Screenshots

Checklist

• 🤖 This change is covered by unit tests (if applicable).
• 🤹 Manual testing has been performed (if necessary).
• 🛡️ Security impacts have been considered (if relevant).
• [] 📖 Documentation updates are complete (if required).
• 🧠 Third-party dependencies and TPIP updated (if required).

[omarArm]

@JonatanAntoni @thorstendb-ARM I acknowledge that there might be some opinions on which parts of the expression should get highlighted. We can discuss it together in a meeting, but these are just some details that can easily be changed

[qltysh]

Coverage Impact

⬆️ Merging this pull request will increase total coverage on main by 0.01%.

Modified Files with Diff Coverage (1)

Rating	File	% Diff	Uncovered Line #s
	src/views/live-watch/live-watch.ts	100.0%
	Total	100.0%

🚦 See full report on Qlty Cloud »

🛟 Help

• Diff Coverage: Coverage for added or modified lines of code (excludes deleted files). Learn more.

• Total Coverage: Coverage for the whole repository, calculated as the sum of all File Coverage. Learn more.

• File Coverage: Covered Lines divided by Covered Lines plus Missed Lines. (Excludes non-executable lines including blank lines and comments.)

  • Indirect Changes: Changes to File Coverage for files that were not modified in this PR. Learn more.

[Copilot]

Pull request overview

Adds change-highlighting behavior to the Live Watch tree so users can more easily spot updated values during debugging (fixes #850).

Changes:

• Introduces a highlightedLabel on Live Watch values and uses it to render highlighted tree item labels.
• Splits evaluation into initial evaluation vs per-node refresh evaluation to detect value changes.
• Updates and extends Jest tests to cover highlight vs non-highlight behavior on refresh.

Reviewed changes

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

File	Description
src/views/live-watch/live-watch.ts	Adds highlightedLabel support and refresh-time change detection to apply label highlighting.
src/views/live-watch/live-watch.test.ts	Updates mocks for renamed evaluation methods and adds tests for highlight behavior.

[jreineckearm]

Gave it a test: Logic for a single update trigger looks good.

Will certainly provoke comments because of the name/expression, not the value ("description") getting highlighted. But the alternative of putting expression and value on the label isn't great either. Might work better for variables, but misleading for watch expressions which themselves can include = characters.

I see however troubles with the highlight getting immediately removed by multiple refresh requests coming in for the same expression after stopping the CPU. Can you confirm this?
Probably needs some debouncing logic....

[jreineckearm]

Retested with a VSIX build from CI. Situation regarding unexpected highlight behavior improves a little.
But it still is a bit unpredictable. Some of it caused by glitches when switching from run to pause state which one didn't necessarily spot before. Let's discuss what can be done to mitigate such confusion until it can be addressed in the adapter.

[omarArm]

I added a coalescing mechanism to help with the flickering behaviour, please let me know if there are anymore bugs you have found