track covariance Pos-def in packedcandidate

[vlimant]

PR description:

as requested in #39599 (comment)

PR validation:

no standard workflow involves a call to this function.

[cmsbuild]

A new Pull Request was created by @vlimant (vlimant) for CMSSW_10_6_X.

It involves the following packages:

• DataFormats/PatCandidates (xpog, reconstruction)

@cmsbuild, @mandrenguyen, @clacaputo, @swertz, @vlimant can you please review it and eventually sign? Thanks.
@gpetruc, @missirol, @gouskos, @rovere, @hatakeyamak this is something you requested to watch as well.
@perrotta, @dpiparo, @rappoccio you are the release manager for this.

cms-bot commands are listed here

• Backported from Option to make track covariance Pos-def in packedcandidate #39599

[mmusich]

type tracking

[mmusich]

@cmsbuild, please test

[mmusich]

backport of #39599

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-e48d11/30001/summary.html
COMMIT: 359a707
CMSSW: CMSSW_10_6_X_2023-01-15-0000/slc7_amd64_gcc700
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/40526/30001/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 6 differences found in the comparisons
• DQMHistoTests: Total files compared: 35
• DQMHistoTests: Total histograms compared: 3215686
• DQMHistoTests: Total failures: 3
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3215349
• DQMHistoTests: Total skipped: 334
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 34 files compared)
• Checked 143 log files, 102 edm output root files, 35 DQM output files
• TriggerResults: no differences found

[mmusich]

Dear @vlimant, yesterday at the ORP meeting it was requested to reduce the spurious changes in this PR coming from code-formatting in order to facilitate the review. I prepared a branch that merges in 10_6_X with the bare minimum of changes: https://github.com/cms-sw/cmssw/compare/CMSSW_10_6_X...mmusich:cmssw:posDef_trackcov_unpacking_10_6_X?expand=1. Please let me know if you prefer to reduce the changes in this PR, or shall I open another one instead.