Add first test for slicing

This MR will allow to slice OfflineTracks, so they return OfflineTracks again (for consistent behaviour). Currently an OfflineTrack is returned, regardless of the slice type (tracks[23] vs tracks[5:23]).

added api usability labels

added 1 commit

• 32f54ee5 - Allow slicing

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added 1 commit

• c4b5fd72 - Improve tests for slicing

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enabled an automatic merge when the pipeline for c4b5fd72 succeeds

canceled the automatic merge

added 1 commit

• 7bd30a17 - Update CHANGELOG.rst

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enabled an automatic merge when the pipeline for 7bd30a17 succeeds

merged

mentioned in commit a0928bcd