The number of matches (highlighted items) should be shown

[qiyitang71]

Original report by Artho Cyrille (Bitbucket: 557058:d037361a-d6a1-4cae-80e0-7b1940bbc779, GitHub: cyrille-artho).

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After selecting a given feature (such as lock/unlock), it would be good to have a way to count the number of matching events.

Challenges:

1. How to show this without being too intrusive.
2. The number of highlighted items may differ in the expanded/collapsed view. This is because the same item may be shown before and after a choice. It would be good to count such cases only once, and especially if this could be made clear to a user as well by showing that the second highlighted event is a recurrent event.