Fix Automatic UI transactions having wrong durations

[stefanosiano]

📜 Description

Automatic Activity transactions now have the ttid start timestamp if appStart span is not present
Span now trims for all transaction children if it's the root span of the transaction

💡 Motivation and Context

The reported duration of the transaction is wrong.

💚 How did you test it?

Added Unit tests

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.

🔮 Next steps

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	326.45 ms	379.51 ms	53.06 ms
Size	1.73 MiB	2.26 MiB	548.10 KiB

Baseline results on branch: main

Startup times

Revision	Plain	With Sentry	Diff
d81684e	235.73 ms	328.76 ms	93.03 ms

App size

Revision	Plain	With Sentry	Diff
d81684e	1.73 MiB	2.26 MiB	547.78 KiB

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (d81684e) 81.31% compared to head (0ba5520) 81.32%.

❗ Current head 0ba5520 differs from pull request most recent head 621e4b1. Consider uploading reports for the commit 621e4b1 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2623      +/-   ##
============================================
+ Coverage     81.31%   81.32%   +0.01%     
- Complexity     4187     4192       +5     
============================================
  Files           336      336              
  Lines         15485    15489       +4     
  Branches       2020     2021       +1     
============================================
+ Hits          12591    12597       +6     
+ Misses         2101     2099       -2     
  Partials        793      793              

Impacted Files	Coverage Δ
sentry/src/main/java/io/sentry/SentryTracer.java	94.14% <ø> (+0.78%)	⬆️
...main/java/io/sentry/protocol/MeasurementValue.java	94.23% <ø> (ø)
sentry/src/main/java/io/sentry/NoOpSpan.java	25.00% <100.00%> (+2.41%)	⬆️
...entry/src/main/java/io/sentry/NoOpTransaction.java	24.44% <100.00%> (+1.71%)	⬆️
sentry/src/main/java/io/sentry/Span.java	89.70% <100.00%> (+0.15%)	⬆️

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[markushi]

LGTM!

[markushi]

love this, explains the "why" really good and will make it easier to re-iterate over this in future.