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NEW: ItemCount(...) expression

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Hendrik:
ItemCount counts the number of files that have the exact same value of the given expression as the file the expression runs in the context of.
Which means it can do things like counting the number of files that belong to the same album as a file you are looking at, or to the same show, or to the same season.

But it can't count the number of seasons, or the number of discs belonging to an album, because it just doesn't know what value you might want. A simple mode doesn't help here. You would have to pass several values, a search expression, a comparison expression, etc. It gets rather unwieldy, and the performance issue might come back.

This is not a relational database, every such operation we do has to literally look at every file, evaluate the expression you specified for it, and then compare the values. This is not fast.

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