Fix decoration getters for xAOD Multitrajectory back-end

This fixes

• an aux type clash between the setter for "next" (unsigned int) and the getter (short)
• usage of the decoration getters for a locked container.

added bugfix label

requested review from @tbold

This will be clashing with: !66992 (merged) On this constGetter - it seems that mutable & const verions need a different implementaions actually.

mentioned in merge request !67044 (merged)

added ACTS label

added 118 commits

• bb303437...22d3b844 - 117 commits from branch atlas:main
• baec9ab3 - Use constDecorationGetter as decoration Getter.

Compare with previous version

• rebase to main 2023-11-13_T1522
• First issue already resolved by MR !66992 (merged)

Hi @goetz is this ready for un-drafting?

resolved all threads

marked this merge request as ready

Jenkins please retry a build

This merge request affects 1 package:

• Tracking/Acts/ActsEvent

This merge request affects 3 files:

• Tracking/Acts/ActsEvent/ActsEvent/MultiTrajectory.icc
• Tracking/Acts/ActsEvent/ActsEvent/TrackStorageContainer.h
• Tracking/Acts/ActsEvent/Root/MultiTrajectory.cxx

Adding @tbold ,@toyamaza ,@jojungge ,@pagessin ,@cvarni as watchers

added Tracking main review-pending-level-1 labels

resolved all threads

CI Result SUCCESS (hash baec9ab3)

	Athena
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 1370]

Looks good from L1 perspective.

Cheers, Anne (L1)

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 4e34d0c1