Fix SharedWriter to track all streams/files so that derivation runs in multi stream mode.

Without this fix, the first stream metadata will switch off writing for the other streams.

This merge request affects 1 package:

• Database/AthenaPOOL/AthenaPoolCnvSvc

This merge request affects 1 file:

• Database/AthenaPOOL/AthenaPoolCnvSvc/src/AthenaPoolCnvSvc.cxx

Adding @mnowak ,@ssnyder as watchers

added Database master review-pending-level-1 labels

CI Result SUCCESS (hash f2f8e365)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 28313]

Code changes look fine, approving. Pienpen(L1)

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

merged

mentioned in commit 3a4253cf

added sweep:ignore label